{"id":16291,"date":"2021-11-27T20:25:47","date_gmt":"2021-11-27T13:25:47","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=16291"},"modified":"2021-11-27T20:25:48","modified_gmt":"2021-11-27T13:25:48","slug":"cac-tac-dong-cua-khi-quyen-co-the-cho-phep-mot-nguoi-nhin-qua-ca-duong-chan-troi-khong","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/cac-tac-dong-cua-khi-quyen-co-the-cho-phep-mot-nguoi-nhin-qua-ca-duong-chan-troi-khong\/","title":{"rendered":"C\u00e1c t\u00e1c \u0111\u1ed9ng c\u1ee7a kh\u00ed quy\u1ec3n c\u00f3 th\u1ec3 cho ph\u00e9p m\u1ed9t ng\u01b0\u1eddi nh\u00ecn qua c\u1ea3 \u0111\u01b0\u1eddng ch\u00e2n tr\u1eddi kh\u00f4ng?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm: H\u00e3y Tr\u1ea3 L\u1eddi Em T\u1ea1i Sao? \u2013 T\u1eadp 12 &#8211; Arkady Leokum<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1ch th\u00f4ng th\u01b0\u1eddng \u0111\u1ec3 t\u00ednh ra kho\u1ea3ng c\u00e1ch t\u1edbi \u0111\u01b0\u1eddng ch\u00e2n tr\u1eddi th\u01b0\u1eddng gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng tr\u00e1i \u0111\u1ea5t l\u00e0 m\u1ed9t qu\u1ea3 c\u1ea7u ho\u00e0n h\u1ea3o, kh\u00f4ng c\u00f3 kh\u00f4ng kh\u00ed m\u00e0 trong tr\u01b0\u1eddng h\u1ee3p \u0111\u00f3 \u00e1nh s\u00e1ng \u0111i theo nh\u1eefng \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 v\u1edbi m\u1ed9t ch\u00fat t\u00ednh to\u00e1n h\u00ecnh h\u1ecdc \u0111\u00e3 ch\u1ec9 ra r\u1eb1ng kho\u1ea3ng c\u00e1ch m\u00e0 ch\u00fang ta c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00f4ng th\u1ee9c sau: l\u1ea5y \u0111\u1ed9 cao so v\u1edbi m\u1ef1c n\u01b0\u1edbc bi\u1ec3n c\u1ee7a n\u01a1i b\u1ea1n \u0111\u1ee9ng (t\u00ednh b\u1eb1ng \u0111\u01a1n v\u1ecb b\u1ed9) c\u1ed9ng th\u00eam 50% r\u1ed3i l\u1ea5y c\u0103n b\u1eadc hai; k\u1ebft qu\u1ea3 ch\u00ednh l\u00e0 kho\u1ea3ng c\u00e1ch t\u1edbi \u0111\u01b0\u1eddng ch\u00e2n tr\u1eddi t\u00ednh b\u1eb1ng d\u1eb7m. V\u1edbi c\u00e1ch t\u00ednh n\u00e0y, m\u1ed9t ng\u01b0\u1eddi cao 6 b\u1ed9 (1,8m) \u0111\u1ee9ng \u1edf m\u1ef1c n\u01b0\u1edbc bi\u1ec3n c\u00f3 th\u1ec3 nh\u00ecn xa 3 d\u1eb7m (4,8km).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tuy nhi\u00ean, c\u00e1ch t\u00ednh n\u00e0y \u0111\u00e3 lo\u1ea1i tr\u1eeb kh\u00ed quy\u1ec3n tr\u00e1i \u0111\u1ea5t, m\u1ed9t y\u1ebfu t\u1ed1 l\u00e0m cong tia s\u00e1ng v\u00e0 nh\u00ecn chung, c\u00f3 th\u1ec3 cho ph\u00e9p ch\u00fang ta nh\u00ecn xa h\u01a1n ph\u1ea7n n\u00e0o \u0111\u00f3. V\u00ec kh\u1ea3 n\u0103ng l\u00e0m cong tia s\u00e1ng c\u1ee7a kh\u00f4ng kh\u00ed \u1edf m\u1ef1c n\u01b0\u1edbc bi\u1ec3n kh\u00e1c bi\u1ec7t 0,003% so v\u1edbi c\u1ee7a ch\u00e2n kh\u00f4ng, n\u00f3 h\u1ea7u nh\u01b0 kh\u00f4ng \u0111\u00e1ng c\u1ed9ng v\u00e0o. Tuy nhi\u00ean, th\u1eadt \u0111\u00e1ng kinh ng\u1ea1c, c\u00e1c t\u00ednh to\u00e1n chi ti\u1ebft l\u1ea1i ch\u1ec9 ra r\u1eb1ng hi\u1ec7u \u1ee9ng kh\u00fac x\u1ea1 n\u00e0y cho ph\u00e9p \u00e1nh s\u00e1ng \u0111\u1ebfn \u0111\u01b0\u1ee3c ch\u00fang ta t\u1eeb kho\u1ea3ng c\u00e1ch xa h\u01a1n kho\u1ea3ng 10% so v\u1edbi k\u1ebft qu\u1ea3 c\u1ee7a c\u00f4ng th\u1ee9c \u0111\u01a1n gi\u1ea3n. N\u00f3i c\u00e1ch kh\u00e1c, kh\u00ed quy\u1ec3n th\u1ef1c s\u1ef1 l\u00e0m t\u0103ng chi\u1ec1u cao c\u1ee7a ch\u00fang ta l\u00ean kho\u1ea3ng 20% khi ch\u00fang ta nh\u00ecn xa v\u1ec1 ch\u00e2n tr\u1eddi, v\u00ec v\u1eady n\u1ebfu \u0111\u1ee9ng t\u1eeb m\u1ed9t \u0111\u1ec9nh n\u00fai cao 3.000 b\u1ed9 (915m), ch\u00fang ta c\u00f3 th\u1ec3 nh\u00ecn \u201cqua c\u1ea3 \u0111\u01b0\u1eddng ch\u00e2n tr\u1eddi\u201d th\u00eam kho\u1ea3ng 5 d\u1eb7m (8km) n\u1eefa.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm: H\u00e3y Tr\u1ea3 L\u1eddi Em T\u1ea1i Sao? \u2013 T\u1eadp 12 &#8211; Arkady Leokum C\u00e1ch th\u00f4ng th\u01b0\u1eddng \u0111\u1ec3 t\u00ednh ra kho\u1ea3ng c\u00e1ch t\u1edbi \u0111\u01b0\u1eddng ch\u00e2n tr\u1eddi th\u01b0\u1eddng gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng tr\u00e1i \u0111\u1ea5t l\u00e0 m\u1ed9t qu\u1ea3 c\u1ea7u ho\u00e0n h\u1ea3o, kh\u00f4ng c\u00f3 kh\u00f4ng kh\u00ed m\u00e0 trong tr\u01b0\u1eddng h\u1ee3p \u0111\u00f3 \u00e1nh s\u00e1ng \u0111i theo nh\u1eefng \u0111\u01b0\u1eddng [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15],"tags":[],"class_list":["post-16291","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/16291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=16291"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/16291\/revisions"}],"predecessor-version":[{"id":16292,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/16291\/revisions\/16292"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=16291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=16291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=16291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}