{"id":20858,"date":"2025-07-07T22:55:52","date_gmt":"2025-07-07T15:55:52","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=20858"},"modified":"2025-07-07T22:55:52","modified_gmt":"2025-07-07T15:55:52","slug":"giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/","title":{"rendered":"Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c nguy\u1ec7t th\u1ef1c v\u1eadt l\u00fd 7 d\u1ec5 hi\u1ec3u"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Bong_toi_la_gi_Bong_toi_la_gi\" >B\u00f3ng t\u1ed1i l\u00e0 g\u00ec? B\u00f3ng t\u1ed1i l\u00e0 g\u00ec?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Bong_toi_la_gi\" >B\u00f3ng t\u1ed1i l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Bong_toi_la_gi-2\" >B\u00f3ng t\u1ed1i l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Giai_thich_hien_tuong_Eclipse_7_vat_ly\" >Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng Eclipse 7 v\u1eadt l\u00fd<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Giai_thich_hien_tuong_Eclipse\" >Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng Eclipse?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Giai_thich_hien_tuong_cua_nhat_thuc_la_gi\" >Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng c\u1ee7a nh\u1eadt th\u1ef1c l\u00e0 g\u00ec?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Nhat_thuc_mot_phan\" >Nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Nhat_thuc_day_du\" >Nh\u1eadt th\u1ef1c \u0111\u1ea7y \u0111\u1ee7<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Mot_nua_-dark\" >M\u1ed9t n\u1eeda -dark<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Giai_cac_bai_tap_vat_ly_7_Bai_3_Trang_9_SGK\" >Gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp v\u1eadt l\u00fd 7 B\u00e0i 3 Trang 9 SGK<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ckconitsha.com\/vn\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-ly-7-de-hieu\/#Bai_tap_vat_ly_7_ve_nhat_thuc_va_nhat_thuc_de_thuc_hanh\" >B\u00e0i t\u1eadp v\u1eadt l\u00fd 7 v\u1ec1 nh\u1eadt th\u1ef1c v\u00e0 nh\u1eadt th\u1ef1c \u0111\u1ec3 th\u1ef1c h\u00e0nh<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p class=\"MsoNormal\">Hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c v\u00e0 nh\u1eadt th\u1ef1c kh\u00f4ng \u0111\u01b0\u1ee3c qu\u00e1 l\u1ea1. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i ai c\u0169ng th\u1ef1c s\u1ef1 hi\u1ec3u t\u1ea1i sao c\u00f3 hai hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y, c\u0169ng nh\u01b0 nhi\u1ec1u \u0111i\u1ec1u th\u00fa v\u1ecb v\u1ec1 ch\u00fang. H\u00e3y \u0111\u1ec3 kh\u1ec9 gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y c\u1ee7a Eclipse 7 v\u1eadt l\u00fd d\u1ef1a tr\u00ean \u1ee9ng d\u1ee5ng truy\u1ec1n tr\u1ef1c ti\u1ebfp c\u1ee7a truy\u1ec1n \u00e1nh s\u00e1ng.<\/p>\n<p>                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/image\/600x480.png\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bong_toi_la_gi_Bong_toi_la_gi\"><\/span>B\u00f3ng t\u1ed1i l\u00e0 g\u00ec? B\u00f3ng t\u1ed1i l\u00e0 g\u00ec?  <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Do gi\u1ea3i th\u00edch hai hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c v\u00e0 nh\u1eadt th\u1ef1c, m\u1ecdi ng\u01b0\u1eddi c\u0169ng s\u1eed d\u1ee5ng c\u00e1c kh\u00e1i ni\u1ec7m nh\u01b0 b\u00f3ng t\u1ed1i v\u00e0 b\u00f3ng t\u1ed1i n\u1eeda \u0111\u1ec3 gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00f3. \u0110\u1ec3 d\u1ec5 d\u00e0ng t\u01b0\u1edfng t\u01b0\u1ee3ng, tr\u01b0\u1edbc ti\u00ean ch\u00fang ta c\u1ea7n t\u00ecm ra b\u00f3ng t\u1ed1i l\u00e0 g\u00ec v\u00e0 m\u1ed9t n\u1eeda l\u00e0 g\u00ec th\u00f4ng qua hai th\u00ed nghi\u1ec7m \u0111\u01a1n gi\u1ea3n d\u01b0\u1edbi \u0111\u00e2y. <\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bong_toi_la_gi\"><\/span>B\u00f3ng t\u1ed1i l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ec3 hi\u1ec3u kh\u00e1i ni\u1ec7m n\u00e0y, h\u00e3y xem m\u1ed9t th\u1eed nghi\u1ec7m b\u00ean d\u01b0\u1edbi<\/p>\n<p dir=\"ltr\"><em>Th\u00ed nghi\u1ec7m 1<\/em><\/p>\n<p dir=\"ltr\">\u0110\u1eb7t m\u1ed9t ngu\u1ed3n s\u00e1ng nh\u1ecf (c\u00f3 th\u1ec3 \u0111\u00e8n pin s\u00e1ng) ph\u00eda tr\u01b0\u1edbc m\u00e0n h\u00ecnh. Trong ph\u1ea1m vi t\u1eeb b\u00f3ng \u0111\u00e8n \u0111\u1ebfn m\u00e0n h\u00ecnh, th\u00eam m\u1ed9t mi\u1ebfng b\u00eca nh\u01b0 h\u00ecnh b\u00ean d\u01b0\u1edbi.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-2.png\" alt=\"H\u00ecnh \u1ea3nh th\u1eed nghi\u1ec7m 1. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<p dir=\"ltr\">Quan s\u00e1t th\u1eed nghi\u1ec7m ch\u00fang ta th\u1ea5y<\/p>\n<ul>\n<li dir=\"ltr\">V\u00f9ng t\u1ed1i: B\u1edfi v\u00ec c\u00e1c tia s\u00e1ng t\u1eeb \u00e1nh s\u00e1ng ph\u00e1t ra theo m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng, c\u00e1c tia s\u00e1ng v\u1edbi n\u1eafp s\u1ebd kh\u00f4ng ch\u1ea1m t\u1edbi m\u00e0n h\u00ecnh. V\u00ec v\u1eady, tr\u00ean r\u00e8m s\u1ebd xu\u1ea5t hi\u1ec7n khu v\u1ef1c kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng t\u1eeb \u0111\u00e8n \u0111\u1ebfn truy\u1ec1n v\u00e0 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 khu v\u1ef1c t\u1ed1i.<\/li>\n<li dir=\"ltr\">V\u00f9ng \u00e1nh s\u00e1ng: B\u1edfi v\u00ec c\u00f3 nh\u1eefng tia s\u00e1ng t\u1eeb \u0111\u00e8n pin \u0111\u1ebfn m\u00e0n h\u00ecnh m\u00e0 kh\u00f4ng b\u1ecb c\u1ea3n tr\u1edf. Do \u0111\u00f3, s\u1ebd c\u00f3 m\u1ed9t t\u1ea5m khi\u00ean tr\u00ean khi\u00ean g\u1ecdi l\u00e0 khu v\u1ef1c \u00e1nh s\u00e1ng.<\/li>\n<\/ul>\n<p dir=\"ltr\">Do \u0111\u00f3, th\u00f4ng qua th\u00ed nghi\u1ec7m, ch\u00fang t\u00f4i \u0111\u00e3 nh\u1eadn x\u00e9t: <\/p>\n<ul>\n<li dir=\"ltr\">V\u00f9ng m\u00e0u \u0111en kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng t\u1eeb ngu\u1ed3n \u00e1nh s\u00e1ng v\u00ec \u00e1nh s\u00e1ng \u0111\u01b0\u1ee3c truy\u1ec1n theo m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng, g\u1eb7p nh\u1eefng ch\u01b0\u1edbng ng\u1ea1i v\u1eadt c\u1ee7a \u00e1nh s\u00e1ng s\u1ebd b\u1ecb ch\u1eb7n v\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/li>\n<\/ul>\n<p dir=\"ltr\">Tr\u00ean h\u00e0ng r\u00e0o \u0111\u01b0\u1ee3c \u0111\u1eb7t ph\u00eda sau m\u1ed9t ch\u01b0\u1edbng ng\u1ea1i v\u1eadt, c\u00f3 m\u1ed9t khu v\u1ef1c kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng t\u1eeb ngu\u1ed3n s\u00e1ng s\u1eafp t\u1edbi g\u1ecdi l\u00e0 b\u00f3ng t\u1ed1i.<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bong_toi_la_gi-2\"><\/span>B\u00f3ng t\u1ed1i l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\"><em>Th\u00ed nghi\u1ec7m 2<\/em><\/p>\n<p dir=\"ltr\">Thay th\u1ebf b\u00f3ng \u0111\u00e8n th\u00e0nh hi\u1ec7u su\u1ea5t cao h\u01a1n (b\u00f3ng \u0111\u00e8n \u0111i\u1ec7n).<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-3.png\" alt=\"H\u00ecnh \u1ea3nh th\u1eed nghi\u1ec7m 2. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<p dir=\"ltr\">Quan s\u00e1t hi\u1ec7n t\u01b0\u1ee3ng m\u00e0 ch\u00fang ta th\u1ea5y: <\/p>\n<p dir=\"ltr\">M\u1ed9t n\u1eeda b\u00f3ng t\u1ed1i: Khu v\u1ef1c ph\u00eda sau n\u1eafp ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t ph\u1ea7n \u00e1nh s\u00e1ng m\u00e0 \u00e1nh s\u00e1ng \u0111i\u1ec7n \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i.<\/p>\n<p dir=\"ltr\">Do \u0111\u00f3, th\u00f4ng qua th\u00ed nghi\u1ec7m, ch\u00fang t\u00f4i \u0111\u00e3 nh\u1eadn x\u00e9t: <\/p>\n<ul>\n<li dir=\"ltr\">Khu v\u1ef1c \u1edf gi\u1eefa m\u00e0n h\u00ecnh t\u1ed1i <\/li>\n<li dir=\"ltr\">Khu v\u1ef1c ngo\u00e0i c\u00f9ng l\u00e0 khu v\u1ef1c s\u00e1ng<\/li>\n<li dir=\"ltr\">Khu v\u1ef1c \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o khu v\u1ef1c \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 khu v\u1ef1c b\u00f3ng m\u1edd <\/li>\n<\/ul>\n<p dir=\"ltr\">Tr\u00ean h\u00e0ng r\u00e0o ph\u00eda sau h\u00e0ng r\u00e0o, c\u00f3 m\u1ed9t khu v\u1ef1c ch\u1ec9 nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng t\u1eeb m\u1ed9t ph\u1ea7n c\u1ee7a ngu\u1ed3n \u00e1nh s\u00e1ng s\u1eafp t\u1edbi \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u00f3ng t\u1ed1i.<\/p>\n<table style=\"border-collapse: collapse;width: 100%;background-color: #fbeeb8\" border=\"1\">\n<tr>\n<td style=\"width: 98.5189%\">\n<p style=\"text-align: center\">\u0110\u1eebng b\u1ecf l\u1ee1 !! Ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc b\u1eb1ng ti\u1ebfng Anh, gi\u00fap ph\u00e1t tri\u1ec3n t\u01b0 duy theo c\u00e1ch to\u00e0n di\u1ec7n nh\u1ea5t. Nh\u1eadn \u01b0u \u0111\u00e3i l\u00ean t\u1edbi 40%, d\u01b0\u1edbi 2k\/ng\u00e0y.<\/p>\n<p style=\"text-align: center\">\n<p><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia.monkeyuni.net\/upload\/web\/img\/button_dang-ky-ngay-1.png\" alt=\"\" width=\"185\"><\/p>\n<\/td>\n<\/tr>\n<\/table>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_thich_hien_tuong_Eclipse_7_vat_ly\"><\/span>Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng Eclipse 7 v\u1eadt l\u00fd <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Trong ch\u01b0\u01a1ng tr\u00ecnh gi\u1ea3ng d\u1ea1y v\u1eadt l\u00fd 7, h\u1ecd s\u1ebd t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c. C\u1ee5 th\u1ec3:<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_thich_hien_tuong_Eclipse\"><\/span>Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng Eclipse?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Eclipse x\u1ea3y ra khi n\u00e0o? Khi m\u1eb7t tr\u0103ng n\u1eb1m gi\u1eefa m\u1eb7t tr\u1eddi v\u00e0 tr\u00e1i \u0111\u1ea5t, m\u1ed9t ph\u1ea7n \u00e1nh s\u00e1ng t\u1eeb m\u1eb7t tr\u1eddi chi\u1ebfu s\u00e1ng tr\u00ean tr\u00e1i \u0111\u1ea5t s\u1ebd b\u1ecb che khu\u1ea5t b\u1edfi m\u1eb7t tr\u0103ng. Sau \u0111\u00f3, tr\u00ean tr\u00e1i \u0111\u1ea5t s\u1ebd xu\u1ea5t hi\u1ec7n t\u1ed1i v\u00e0 m\u1ed9t n\u1eeda -dark. <\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-4.jpg\" alt=\"H\u00ecnh minh h\u1ecda cho nh\u1eadt th\u1ef1c. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<p dir=\"ltr\">N\u1ebfu ch\u00fang ta \u0111\u1ee9ng trong b\u00f3ng t\u1ed1i, ch\u00fang ta s\u1ebd kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi, ch\u00fang ta n\u00f3i r\u1eb1ng c\u00f3 m\u1ed9t nh\u1eadt th\u1ef1c ho\u00e0n to\u00e0n. N\u1ebfu ch\u00fang ta \u0111\u1ee9ng trong b\u00f3ng t\u1ed1i, ch\u00fang ta s\u1ebd th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a m\u1eb7t tr\u1eddi, ch\u00fang ta n\u00f3i r\u1eb1ng c\u00f3 m\u1ed9t nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n \u1edf \u0111\u00f3.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-5.jpg\" alt=\"H\u00ecnh \u1ea3nh c\u1ee7a nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n di\u1ec5n ra v\u00e0o ng\u00e0y 19 th\u00e1ng 3 t\u1ea1i Vi\u1ec7t Nam. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<p dir=\"ltr\">H\u00ecnh \u1ea3nh c\u1ee7a nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n di\u1ec5n ra v\u00e0o ng\u00e0y 19 th\u00e1ng 3 t\u1ea1i Vi\u1ec7t Nam. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)<\/p>\n<h3 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_thich_hien_tuong_cua_nhat_thuc_la_gi\"><\/span>Gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng c\u1ee7a nh\u1eadt th\u1ef1c l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p dir=\"ltr\">Khi tr\u00e1i \u0111\u1ea5t n\u1eb1m gi\u1eefa m\u1eb7t tr\u0103ng v\u00e0 m\u1eb7t tr\u1eddi, m\u1eb7t tr\u0103ng s\u1ebd b\u1ecb che khu\u1ea5t b\u1edfi tr\u00e1i \u0111\u1ea5t, n\u00f3 kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng t\u1eeb m\u1eb7t tr\u1eddi \u0111\u1ec3 ch\u00fang ta kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y m\u1eb7t tr\u0103ng. Ch\u00fang t\u00f4i n\u00f3i r\u1eb1ng hi\u1ec7n t\u01b0\u1ee3ng \u0111\u00e3 x\u1ea3y ra t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3.<\/p>\n<p dir=\"ltr\">Hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c c\u00f3 nhi\u1ec1u lo\u1ea1i kh\u00e1c nhau nh\u01b0ng ch\u1ec9 c\u00f3 3 lo\u1ea1i kinh nguy\u1ec7t ch\u00ednh v\u00e0 th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n nh\u1ea5t: <\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Nhat_thuc_mot_phan\"><\/span><em>Nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n<\/em><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y x\u1ea3y ra khi m\u1eb7t tr\u1eddi, tr\u00e1i \u0111\u1ea5t v\u00e0 m\u1eb7t tr\u0103ng n\u1eb1m tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng g\u1ea7n nhau. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, \u00e1nh tr\u0103ng s\u1ebd b\u1ecb phai m\u00e0u v\u00e0 m\u1eb7t tr\u0103ng b\u1ecb v\u00f4 hi\u1ec7u h\u00f3a m\u1ed9t ph\u1ea7n. C\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y b\u00f3ng c\u1ee7a tr\u00e1i \u0111\u1ea5t \u0111en (ho\u1eb7c m\u00e0u \u0111\u1ecf s\u1eabm) che khu\u1ea5t m\u1eb7t tr\u0103ng.<\/p>\n<p dir=\"ltr\">Trong qu\u00e1 tr\u00ecnh nh\u1eadt th\u1ef1c to\u00e0n ph\u1ea7n, nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n s\u1ebd xu\u1ea5t hi\u1ec7n tr\u01b0\u1edbc v\u00e0 sau khi nh\u1eadt th\u1ef1c to\u00e0n ph\u1ea7n. Nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n th\u01b0\u1eddng s\u1ebd k\u00e9o d\u00e0i kho\u1ea3ng 6 gi\u1edd.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-6.jpg\" alt=\"H\u00ecnh \u1ea3nh c\u1ee7a ph\u1ea7n nh\u1eadt th\u1ef1c. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Nhat_thuc_day_du\"><\/span><em>Nh\u1eadt th\u1ef1c \u0111\u1ea7y \u0111\u1ee7<\/em><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">X\u1ea3y ra khi m\u1eb7t tr\u1eddi, tr\u00e1i \u0111\u1ea5t v\u00e0 m\u1eb7t tr\u0103ng \u0111ang n\u1eb1m xen k\u1ebd. V\u00e0o th\u1eddi \u0111i\u1ec3m \u0111\u00f3, m\u1eb7t tr\u0103ng b\u01b0\u1edbc v\u00e0o b\u00f3ng t\u1ed1i c\u1ee7a tr\u00e1i \u0111\u1ea5t. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, \u00e1nh tr\u0103ng s\u1ebd b\u1ecb phai m\u00e0u v\u00e0 m\u1eb7t tr\u0103ng s\u1ebd c\u00f3 m\u00e0u \u0111\u1ecf, \u0111\u00f4i khi n\u00f3 s\u1ebd c\u00f3 m\u00e0u cam \u0111\u1eadm. <\/p>\n<p dir=\"ltr\">Khi nh\u1eadt th\u1ef1c \u0111\u1ea7y \u0111\u1ee7 di\u1ec5n ra, tia n\u1eafng m\u1eb7t tr\u1eddi tr\u01b0\u1edbc khi \u0111\u1ebfn m\u1eb7t tr\u0103ng \u0111ang chi\u1ebfu v\u00e0o b\u00f3ng t\u1ed1i c\u1ee7a tr\u00e1i \u0111\u1ea5t v\u00e0 b\u1ecb kh\u00fac x\u1ea1 b\u1edfi b\u1ea7u kh\u00ed quy\u1ec3n c\u1ee7a Tr\u00e1i \u0111\u1ea5t. C\u00e1c tia b\u01b0\u1edbc s\u00f3ng ng\u1eafn \u0111\u00e3 b\u1ecb ch\u1eb7n, ch\u1ec9 c\u00f2n l\u1ea1i c\u00e1c tia c\u00f3 b\u01b0\u1edbc s\u00f3ng d\u00e0i (\u0111\u1ecf, cam) qua. Do \u0111\u00f3, m\u1eb7t tr\u0103ng th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n d\u01b0\u1edbi m\u00e0u \u0111\u1ecf nh\u1ea1t. Th\u1eddi gian t\u1ed1i \u0111a c\u1ee7a nh\u1eadt th\u1ef1c t\u1ed5ng \u00e2m: 104 ph\u00fat (trong tr\u01b0\u1eddng h\u1ee3p th\u01b0\u1eddng t\u00e1i ph\u00e1t).<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-7.jpg\" alt=\"H\u00ecnh minh h\u1ecda cho nh\u1eadt th\u1ef1c to\u00e0n ph\u1ea7n. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<h4 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Mot_nua_-dark\"><\/span><em>M\u1ed9t n\u1eeda -dark<\/em><span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p dir=\"ltr\">X\u1ea3y ra khi m\u1eb7t tr\u0103ng \u0111i qua n\u1eeda t\u1ed1i c\u1ee7a tr\u00e1i \u0111\u1ea5t. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, \u00e1nh tr\u0103ng s\u1ebd m\u1edd \u0111i v\u00e0 m\u1eb7t tr\u0103ng s\u1ebd m\u1edd v\u00e0 t\u1ed1i. Nguy\u1ec7t th\u1ef1c Semi -lunar r\u1ea5t kh\u00f3 nh\u00ecn th\u1ea5y b\u1eb1ng m\u1eaft th\u01b0\u1eddng do m\u00e0u \u0111\u1ecf c\u1ee7a m\u1eb7t tr\u1eddi.<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-8.jpg\" alt=\"Minh h\u1ecda cho m\u1ed9t n\u1eeda -dark. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<p dir=\"ltr\">\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_cac_bai_tap_vat_ly_7_Bai_3_Trang_9_SGK\"><\/span>Gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp v\u1eadt l\u00fd 7 B\u00e0i 3 Trang 9 SGK<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">B\u00e0i 1: C\u00e2u 3 (Trang 10 S\u00e1ch gi\u00e1o khoa V\u1eadt l\u00fd 7): Gi\u1ea3i th\u00edch t\u1ea1i sao \u0111\u1ee9ng \u1edf n\u01a1i c\u00f3 to\u00e0n b\u1ed9 nh\u1eadt th\u1ef1c, ch\u00fang ta kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi v\u00e0 nh\u00ecn th\u1ea5y n\u00f3 t\u1ed1i?<\/p>\n<p dir=\"ltr\"><img decoding=\"async\" style=\"margin-left: auto;margin-right: auto\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/giai-thich-hien-tuong-nhat-thuc-nguyet-thuc-vat-li-7-de-hieu-9.jpg\" alt=\"\" width=\"600\"><\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: <\/p>\n<p dir=\"ltr\">N\u01a1i m\u00e0 to\u00e0n b\u1ed9 nh\u1eadt th\u1ef1c n\u1eb1m trong b\u00f3ng t\u1ed1i c\u1ee7a m\u1eb7t tr\u0103ng, b\u1ecb che khu\u1ea5t b\u1edfi m\u1eb7t tr\u0103ng \u0111\u1ec3 ng\u0103n \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi \u0111\u1ebfn. V\u00ec v\u1eady, \u0111\u1ee9ng \u1edf n\u01a1i m\u00e0 to\u00e0n b\u1ed9 nh\u1eadt th\u1ef1c kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi v\u00e0 nh\u00ecn th\u1ea5y tr\u1eddi t\u1ed1i.<\/p>\n<p dir=\"ltr\">Ngo\u00e0i ra, \u0111\u1ec3 c\u00f3 th\u1ec3 xem x\u00e9t k\u1ef9 h\u01a1n c\u00e1c lo\u1ea1i b\u00e0i vi\u1ebft li\u00ean quan \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o m\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi d\u01b0\u1edbi \u0111\u00e2y. Nh\u1eefng c\u00e2u h\u1ecfi n\u00e0y kh\u00e1 gi\u1ed1ng nhau trong c\u00e1c b\u00e0i ki\u1ec3m tra m\u00e0 gi\u00e1o vi\u00ean th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n, v\u00ec v\u1eady h\u00e3y c\u1ed1 g\u1eafng th\u1ef1c h\u00e0nh r\u1ea5t nhi\u1ec1u.<\/p>\n<p dir=\"ltr\">B\u00e0i 2: V\u00e0o ban \u0111\u00eam, ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u00e8n trong ph\u00f2ng. N\u00e2ng tay gi\u1eefa \u0111\u00e8n v\u00e0 t\u01b0\u1eddng, ch\u00fang ta quan s\u00e1t tr\u00ean t\u01b0\u1eddng?<\/p>\n<ol style=\"list-style-type: upper-alpha\">\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">M\u1ed9t khu v\u1ef1c t\u1ed1i t\u0103m b\u1eb1ng tay<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">V\u00f9ng s\u00e1ng \u0111\u01b0\u1ee3c chi\u1ebfu s\u00e1ng \u0111\u1ea7y \u0111\u1ee7<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">M\u1ed9t b\u00f3ng t\u1ed1i tr\u00f2n<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">M\u1ed9t khu v\u1ef1c c\u00f3 b\u00e0n tay t\u1ed1i, \u0111\u01b0\u1ee3c bao quanh b\u1edfi bi\u00ean gi\u1edbi m\u1edd<\/p>\n<\/li>\n<\/ol>\n<p>H\u01b0\u1edbng d\u1eabn gi\u1ea3i ph\u00e1p:<\/p>\n<p dir=\"ltr\">B\u00e0n tay gi\u1eefa \u0111\u00e8n v\u00e0 t\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t \u00e1nh s\u00e1ng -shield. V\u00e0o th\u1eddi \u0111i\u1ec3m n\u00e0y, b\u1ee9c t\u01b0\u1eddng s\u1ebd xu\u1ea5t hi\u1ec7n b\u00f3ng t\u1ed1i v\u00e0 m\u1ed9t n\u1eeda b\u00f3ng c\u1ee7a b\u00e0n tay, \u0111\u00f3 l\u00e0 m\u1ed9t khu v\u1ef1c c\u00f3 b\u00e0n tay t\u1ed1i, \u0111\u01b0\u1ee3c bao quanh b\u1edfi m\u1ed9t \u0111\u01b0\u1eddng vi\u1ec1n m\u1edd h\u01a1n.<\/p>\n<p dir=\"ltr\">H\u00ecnh d\u1ea1ng c\u1ee7a b\u00f3ng t\u1ed1i v\u00e0 b\u00f3ng t\u1ed1i gi\u1ed1ng nh\u01b0 b\u00e0n tay l\u00e0 do nh\u1eefng tia s\u00e1ng truy\u1ec1n theo m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng.<\/p>\n<p dir=\"ltr\">C\u00e2u tr\u1ea3 l\u1eddi \u0111\u01b0\u1ee3c ch\u1ecdn l\u00e0: D<\/p>\n<p dir=\"ltr\">B\u00e0i 3: Khi \u0111\u1ee9ng trong b\u00f3ng t\u1ed1i ho\u1eb7c m\u1ed9t n\u1eeda -dark, ch\u00fang ta c\u00f3 th\u1ec3 quan s\u00e1t to\u00e0n b\u1ed9 hi\u1ec7n t\u01b0\u1ee3ng m\u1eb7t tr\u1eddi. T\u1ea1i sao b\u1ea1n kh\u1eb3ng \u0111\u1ecbnh \u0111i\u1ec1u \u0111\u00f3?<\/p>\n<ol style=\"list-style-type: upper-alpha\">\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ee9ng trong b\u00f3ng m\u1ed9t n\u1eeda b\u00f3ng t\u1ed1i. B\u1edfi v\u00ec \u0111\u1ee9ng trong t\u01b0 th\u1ebf t\u1ed1i, ch\u00fang ta c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi, ch\u00fang ta g\u1ecdi n\u00f3 l\u00e0 nh\u1eadt th\u1ef1c ho\u00e0n to\u00e0n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ee9ng trong b\u00f3ng t\u1ed1i. B\u1edfi v\u00ec \u0111\u1ee9ng trong t\u01b0 th\u1ebf t\u1ed1i, ch\u00fang ta kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi, ch\u00fang ta g\u1ecdi n\u00f3 l\u00e0 nh\u1eadt th\u1ef1c ho\u00e0n to\u00e0n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ee9ng trong b\u00f3ng m\u1ed9t n\u1eeda b\u00f3ng t\u1ed1i. B\u1edfi v\u00ec \u0111\u1ee9ng trong t\u01b0 th\u1ebf t\u1ed1i, ch\u00fang ta kh\u00f4ng th\u1ea5y m\u1eb7t tr\u1eddi, ch\u00fang ta g\u1ecdi n\u00f3 l\u00e0 nh\u1eadt th\u1ef1c ho\u00e0n to\u00e0n.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u1ee9ng trong b\u00f3ng t\u1ed1i. B\u1edfi v\u00ec \u0111\u1ee9ng trong b\u00f3ng t\u1ed1i, ch\u00fang ta s\u1ebd th\u1ea5y m\u1eb7t tr\u1eddi m\u00e0 ch\u00fang ta g\u1ecdi l\u00e0 nh\u1eadt th\u1ef1c ho\u00e0n to\u00e0n.<\/p>\n<\/li>\n<\/ol>\n<p>Tr\u1ea3 l\u1eddi: B. \u0110\u1ee9ng trong b\u00f3ng t\u1ed1i. B\u1edfi v\u00ec \u0111\u1ee9ng trong t\u01b0 th\u1ebf t\u1ed1i, ch\u00fang ta kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi, ch\u00fang ta g\u1ecdi n\u00f3 l\u00e0 nh\u1eadt th\u1ef1c ho\u00e0n to\u00e0n.<\/p>\n<p dir=\"ltr\">B\u00e0i h\u1ecdc 4: \u0110\u1ee9ng tr\u00ean m\u1eb7t \u0111\u1ea5t, nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0o sau \u0111\u00e2y ch\u00fang ta th\u1ea5y nh\u1eadt th\u1ef1c?<\/p>\n<ol style=\"list-style-type: upper-alpha\">\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">V\u00e0o ban \u0111\u00eam, khi ch\u00fang t\u00f4i \u0111\u1ee9ng, ch\u00fang t\u00f4i kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">V\u00e0o ban \u0111\u00eam, khi m\u1eb7t tr\u0103ng kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi v\u00ec tr\u00e1i \u0111\u1ea5t b\u1ecb che khu\u1ea5t.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Khi m\u1eb7t tr\u1eddi che khu\u1ea5t m\u1eb7t tr\u0103ng, kh\u00f4ng cho ph\u00e9p \u00e1nh s\u00e1ng t\u1eeb m\u1eb7t tr\u0103ng xu\u1ed1ng tr\u00e1i \u0111\u1ea5t.<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Khi m\u1eb7t tr\u0103ng che khu\u1ea5t m\u1eb7t tr\u1eddi, ch\u00fang ta ch\u1ec9 nh\u00ecn th\u1ea5y ph\u00eda sau m\u1eb7t tr\u0103ng t\u1ed1i.<\/p>\n<\/li>\n<\/ol>\n<p>Tr\u1ea3 l\u1eddi: B. V\u00e0o ban \u0111\u00eam, khi m\u1eb7t tr\u0103ng kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi v\u00ec tr\u00e1i \u0111\u1ea5t b\u1ecb che khu\u1ea5t.<\/p>\n<p dir=\"ltr\">B\u00e0i 5: \u0110\u1eb7t m\u1ed9t ng\u1ecdn n\u1ebfn tr\u01b0\u1edbc m\u00e0n h\u00ecnh \u00e1nh s\u00e1ng. \u0110\u1ec3 m\u1eaft trong khu v\u1ef1c b\u00f3ng t\u1ed1i, ch\u00fang t\u00f4i quan s\u00e1t n\u1ebfn \u0111\u1ec3 xem nh\u1eefng g\u00ec kh\u00e1c v\u1edbi khi kh\u00f4ng c\u00f3 khi\u00ean?<\/p>\n<ol style=\"list-style-type: upper-alpha\">\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfn s\u00e1ng h\u01a1n l\u00e0 y\u1ebfu h\u01a1n<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfn s\u00e1ng h\u01a1n m\u1ea1nh h\u01a1n<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Kh\u00f4ng c\u00f3 g\u00ec kh\u00e1c<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Ch\u1ec9 nh\u00ecn th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a n\u1ebfn<\/p>\n<\/li>\n<\/ol>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: D. Ch\u1ec9 nh\u00ecn th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a n\u1ebfn<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Bai_tap_vat_ly_7_ve_nhat_thuc_va_nhat_thuc_de_thuc_hanh\"><\/span>B\u00e0i t\u1eadp v\u1eadt l\u00fd 7 v\u1ec1 nh\u1eadt th\u1ef1c v\u00e0 nh\u1eadt th\u1ef1c \u0111\u1ec3 th\u1ef1c h\u00e0nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd l\u1edbp 7 \u0111\u1ec3 h\u1ecd t\u1ef1 r\u00e8n luy\u1ec7n:<\/p>\n<p class=\"MsoNormal\">C\u00e2u 1.<\/p>\n<p class=\"MsoNormal\">A. M\u1eb7t tr\u0103ng b\u1ecb che khu\u1ea5t ho\u00e0n to\u00e0n m\u00e0 kh\u00f4ng nh\u1eadn \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi.<\/p>\n<p class=\"MsoNormal\">B. M\u1eb7t tr\u0103ng b\u1ecb che khu\u1ea5t ho\u00e0n to\u00e0n, \u0111\u01b0\u1ee3c bao quanh b\u1edfi l\u1eeda.<\/p>\n<p class=\"MsoNormal\">C. M\u1eb7t tr\u0103ng b\u1ecb che khu\u1ea5t v\u00e0 kh\u00f4ng nh\u00ecn th\u1ea5y b\u1ea5t k\u1ef3 tia n\u00e0o c\u1ee7a m\u1eb7t tr\u1eddi.<\/p>\n<p class=\"MsoNormal\">D. M\u1ed9t ph\u1ea7n c\u1ee7a m\u1eb7t tr\u0103ng b\u1ecb che khu\u1ea5t, ph\u1ea7n c\u00f2n l\u1ea1i l\u00e0 m\u1ed9t n\u1eeda.<\/p>\n<p class=\"MsoNormal\">E. M\u1ed9t ph\u1ea7n c\u1ee7a m\u1eb7t tr\u0103ng b\u1ecb che khu\u1ea5t v\u00e0 nh\u00ecn th\u1ea5y nh\u1eefng tia n\u1eafng m\u1eb7t tr\u1eddi<\/p>\n<p class=\"MsoNormal\">C\u00e2u 2. \u1ede n\u01a1i x\u1ea3y ra nh\u1eadt th\u1ef1c m\u1ed9t ph\u1ea7n, sau \u0111\u00f3:<\/p>\n<p class=\"MsoNormal\">A. Ng\u01b0\u1eddi \u1edf \u0111\u00f3 kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u0103ng.<\/p>\n<p class=\"MsoNormal\">B. Ng\u01b0\u1eddi \u1edf \u0111\u00f3 ch\u1ec9 nh\u00ecn th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a m\u1eb7t tr\u0103ng.<\/p>\n<p class=\"MsoNormal\">C. C\u00f3 trong b\u00f3ng t\u1ed1i c\u1ee7a m\u1eb7t tr\u0103ng.<\/p>\n<p class=\"MsoNormal\">D. Ng\u01b0\u1eddi \u1edf \u0111\u00f3 kh\u00f4ng nh\u00ecn th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a m\u1eb7t tr\u1eddi.<\/p>\n<p class=\"MsoNormal\">E. Ng\u01b0\u1eddi \u1edf \u0111\u00f3 kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u0103ng v\u00e0 m\u1eb7t tr\u1eddi.<\/p>\n<p class=\"MsoNormal\">C\u00e2u 3. \u0110\u1ec3 gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c, m\u1ecdi ng\u01b0\u1eddi d\u1ef1a v\u00e0o:<\/p>\n<p class=\"MsoNormal\">A. Lu\u1eadt truy\u1ec1n \u00e1nh s\u00e1ng<\/p>\n<p class=\"MsoNormal\">B. Lu\u1eadt ph\u1ea3n chi\u1ebfu \u00e1nh s\u00e1ng<\/p>\n<p class=\"MsoNormal\">C. \u0110\u1ecbnh lu\u1eadt kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng<\/p>\n<p class=\"MsoNormal\">D. c\u1ea3 3 lu\u1eadt tr\u00ean<\/p>\n<p class=\"MsoNormal\">C\u00e2u 4. C\u00e2u n\u00e0o l\u00e0 t\u1ed1t nh\u1ea5t?<\/p>\n<p class=\"MsoNormal\">A. Khi c\u00f3 nh\u1eadt th\u1ef1c, m\u1eb7t tr\u0103ng t\u1ea1o ra b\u00f3ng t\u1ed1i tr\u00ean tr\u00e1i \u0111\u1ea5t.<\/p>\n<p class=\"MsoNormal\">B. Nguy\u1ec7t th\u1ef1c ch\u1ec9 xu\u1ea5t hi\u1ec7n v\u00e0o ban \u0111\u00eam.<\/p>\n<p class=\"MsoNormal\">C. Nh\u1eadt th\u1ef1c ch\u1ec9 xu\u1ea5t hi\u1ec7n v\u00e0o ban ng\u00e0y v\u1edbi m\u1eb7t tr\u1eddi nh\u01b0 m\u1ed9t ngu\u1ed3n s\u00e1ng.<\/p>\n<p class=\"MsoNormal\">D. c\u1ea3 3 t\u00f9y ch\u1ecdn \u0111\u1ec1u \u0111\u00fang<\/p>\n<p class=\"MsoNormal\">C\u00e2u 5. T\u1ea1i sao khi ch\u00fang ta c\u00f3 nh\u1eadt th\u1ef1c, \u0111\u1ee9ng tr\u00ean m\u1eb7t \u0111\u1ea5t tr\u00ean nh\u1eefng \u0111\u00e1m m\u00e2y ban ng\u00e0y, ch\u00fang ta kh\u00f4ng nh\u00ecn th\u1ea5y m\u1eb7t tr\u1eddi.<\/p>\n<p class=\"MsoNormal\">A. V\u00ec m\u1eb7t tr\u1eddi l\u00fac \u0111\u00f3 kh\u00f4ng ph\u00e1t ra \u00e1nh s\u00e1ng n\u1eefa.<\/p>\n<p class=\"MsoNormal\">B. B\u1edfi v\u00ec t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3, m\u1eb7t tr\u1eddi kh\u00f4ng chi\u1ebfu s\u00e1ng tr\u00e1i \u0111\u1ea5t n\u1eefa.<\/p>\n<p class=\"MsoNormal\">C. B\u1edfi v\u00ec t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3, m\u1eb7t tr\u1eddi b\u1ecb che khu\u1ea5t b\u1edfi m\u1eb7t tr\u0103ng, ch\u00fang ta \u0111\u00e3 \u1edf trong b\u00f3ng t\u1ed1i c\u1ee7a m\u1eb7t tr\u0103ng.<\/p>\n<p class=\"MsoNormal\">D. V\u00ec m\u1eaft t\u00f4i \u0111\u1ed9t nhi\u00ean b\u1ecb m\u00f9, t\u00f4i kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y b\u1ea5t c\u1ee9 \u0111i\u1ec1u g\u00ec<\/p>\n<p class=\"MsoNormal\">C\u00e2u 6. Khi hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c v\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c, v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a tr\u00e1i \u0111\u1ea5t, m\u1eb7t tr\u1eddi v\u00e0 m\u1eb7t tr\u0103ng nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n<p class=\"MsoNormal\">C\u00e2u 7. \u0110\u1ed5 \u0111\u1ea7y c\u00e1c t\u1eeb th\u00edch h\u1ee3p trong c\u00e1c d\u1ea5u ch\u1ea5m trong c\u00e1c c\u00e2u sau:<\/p>\n<p class=\"MsoNormal\">A) Nh\u1eadt th\u1ef1c \u0111\u01b0\u1ee3c quan s\u00e1t th\u1ea5y trong tr\u00f2 ch\u01a1i \u0111i\u1ec7n t\u1eed. Khi \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 che khu\u1ea5t \u00e1nh s\u00e1ng t\u1eeb<\/p>\n<p class=\"MsoNormal\">b) Nguy\u1ec7t th\u1ef1c th\u01b0\u1eddng \u0111\u01b0\u1ee3c quan s\u00e1t th\u1ea5y v\u00e0o ban \u0111\u00eam, .. &#8230; .. Khi<\/p>\n<p class=\"MsoNormal\">C\u00e2u 8. M\u1ed9t h\u1ecdc sinh n\u00f3i r\u1eb1ng khi nh\u1eadt th\u1ef1c x\u1ea3y ra, m\u1ecdi ng\u01b0\u1eddi \u0111\u1ee9ng tr\u00ean tr\u00e1i \u0111\u1ea5t \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c quan s\u00e1t. Theo t\u00f4i, c\u00f3 \u0111\u00fang kh\u00f4ng, t\u1ea1i sao?<\/p>\n<p class=\"MsoNormal\">C\u00e2u 9.<\/p>\n<p class=\"MsoNormal\">M\u1ed9t v\u00e0 Binh ng\u01b0\u1edbc l\u00ean b\u1ea7u tr\u1eddi \u0111\u1ec3 th\u1ea5y m\u1eb7t tr\u0103ng h\u00ecnh l\u01b0\u1ee1i li\u1ec1m. Binh cho bi\u1ebft \u0111\u00f3 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c, nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c kh\u1eb3ng \u0111\u1ecbnh. N\u1ebfu m\u1ed9t l\u00e0 \u0111\u00fang, b\u1ea1n ngh\u0129 g\u00ec \u0111\u00e3 d\u1ef1a tr\u00ean?<\/p>\n<p class=\"MsoNormal\">C\u00e2u 10.<\/p>\n<p class=\"MsoNormal\">T\u1ea1i sao nh\u1eadt th\u1ef1c th\u01b0\u1eddng x\u1ea3y ra v\u00e0o ng\u00e0y tr\u0103ng tr\u00f2n v\u00e0 th\u1eddi k\u1ef3 nh\u1eadt th\u1ef1c th\u01b0\u1eddng d\u00e0i h\u01a1n nh\u1eadt th\u1ef1c?<\/p>\n<p class=\"MsoNormal\">C\u00e2u 11: V\u00e0o ban \u0111\u00eam, s\u1eed d\u1ee5ng m\u00e1y t\u00ednh x\u00e1ch tay \u0111\u1ec3 che \u0111\u00e8n b\u00f3ng \u0111\u00e8n, tr\u00ean b\u00e0n s\u1ebd t\u1ed1i, \u0111\u00f4i khi kh\u00f4ng th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c. Nh\u01b0ng n\u1ebfu ch\u00fang ta s\u1eed d\u1ee5ng m\u1ed9t cu\u1ed1n s\u1ed5 tay \u0111\u1ec3 che \u1ed1ng, ch\u00fang ta v\u1eabn c\u00f3 th\u1ec3 \u0111\u1ecdc. Gi\u1ea3i th\u00edch t\u1ea1i sao c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00f3?<\/p>\n<p dir=\"ltr\" style=\"line-height: 1.38;text-align: justify;background-color: #ffffff;margin-top: 0pt;margin-bottom: 0pt;padding: 0pt 0pt 12pt 0pt\">Tr\u00ean \u0111\u00e2y l\u00e0 m\u1ed9t b\u1ea3n t\u00f3m t\u1eaft v\u1ec1 ki\u1ebfn \u200b\u200bth\u1ee9c v\u00e0 gi\u1ea3i th\u00edch v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng Eclipse 7 v\u1eadt l\u00fd d\u1ec5 hi\u1ec3u r\u1eb1ng con kh\u1ec9 \u0111\u01b0\u1ee3c bi\u00ean so\u1ea1n cho b\u1ea1n. Hy v\u1ecdng r\u1eb1ng vi\u1ec7c chia s\u1ebb \u1edf tr\u00ean s\u1ebd gi\u00fap m\u1ecdi ng\u01b0\u1eddi nh\u1edb b\u00e0i h\u1ecdc cho m\u1ed9t c\u00e1ch d\u00e0i nh\u1ea5t. N\u1ebfu b\u1ea1n th\u1ea5y n\u00f3 th\u00fa v\u1ecb, h\u00e3y theo d\u00f5i kh\u1ec9 v\u00e0 th\u01b0\u1eddng xuy\u00ean truy c\u1eadp ki\u1ebfn \u200b\u200bth\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ec3 c\u00f3 th\u1ec3 c\u1eadp nh\u1eadt cho m\u00ecnh nh\u1eefng b\u00e0i h\u1ecdc h\u1eefu \u00edch.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hi\u1ec7n t\u01b0\u1ee3ng nh\u1eadt th\u1ef1c v\u00e0 nh\u1eadt th\u1ef1c kh\u00f4ng \u0111\u01b0\u1ee3c qu\u00e1 l\u1ea1. Tuy nhi\u00ean, kh\u00f4ng ph\u1ea3i ai c\u0169ng th\u1ef1c s\u1ef1 hi\u1ec3u t\u1ea1i sao c\u00f3 hai hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y, c\u0169ng nh\u01b0 nhi\u1ec1u \u0111i\u1ec1u th\u00fa v\u1ecb v\u1ec1 ch\u00fang. H\u00e3y \u0111\u1ec3 kh\u1ec9 gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y c\u1ee7a Eclipse 7 v\u1eadt l\u00fd d\u1ef1a tr\u00ean \u1ee9ng d\u1ee5ng truy\u1ec1n tr\u1ef1c ti\u1ebfp&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-20858","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20858","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/comments?post=20858"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20858\/revisions"}],"predecessor-version":[{"id":24756,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20858\/revisions\/24756"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=20858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=20858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=20858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}