{"id":5940,"date":"2021-11-20T10:13:30","date_gmt":"2021-11-20T03:13:30","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=5940"},"modified":"2021-11-20T13:24:10","modified_gmt":"2021-11-20T06:24:10","slug":"vi-sao-khi-xem-truyen-hinh-nguoi-va-tivi-phai-giu-khoang-cach-nhat-dinh","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vi-sao-khi-xem-truyen-hinh-nguoi-va-tivi-phai-giu-khoang-cach-nhat-dinh\/","title":{"rendered":"V\u00ec sao khi xem truy\u1ec1n h\u00ecnh, ng\u01b0\u1eddi v\u00e0 tivi ph\u1ea3i gi\u1eef kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh?"},"content":{"rendered":"\n<p>Kho\u1ea3ng c\u00e1ch c\u1ee7a tivi l\u00e0 ch\u1ec9 kho\u1ea3ng c\u00e1ch gi\u1eefa m\u1eaft ng\u01b0\u1eddi v\u1edbi \u0111i\u1ec3m gi\u1eefa c\u1ee7a m\u00e0n h\u00ecnh. Chi\u1ec1u d\u00e0i c\u1ee7a kho\u1ea3ng c\u00e1ch n\u00e0y ph\u1ea3i d\u1ef1a v\u00e0o k\u00edch th\u01b0\u1edbc m\u00e0n h\u00ecnh c\u1ee7a tivi m\u00e0 quy\u1ebft \u0111\u1ecbnh. Theo t\u00ednh to\u00e1n chung, kho\u1ea3ng c\u00e1ch n\u00e0y ph\u1ea3i g\u1ea5p 7 &#8211; 8 l\u1ea7n chi\u1ec1u cao c\u1ee7a m\u00e0n h\u00ecnh tivi. N\u1ebfu l\u00e0 tivi 35 cm, kho\u1ea3ng c\u00e1ch xem v\u00e0o kho\u1ea3ng 1,8 &#8211; 2 m; kho\u1ea3ng c\u00e1ch xem c\u1ee7a tivi 47 cm v\u00e0o kho\u1ea3ng 2,2 &#8211; 2,6 m.<\/p>\n\n\n\n<p>M\u1eaft \u1edf g\u1ea7n m\u00e0n h\u00ecnh qu\u00e1, h\u00ecnh \u1ea3nh tr\u00ean m\u00e0n h\u00ecnh tr\u00e1i l\u1ea1i tr\u1edf n\u00ean kh\u00f4ng n\u00e9t. \u0110\u00f3 l\u00e0 v\u00ec h\u00ecnh \u1ea3nh hi\u1ec7n ra tr\u00ean m\u00e0n h\u00ecnh tivi do h\u00e0ng ng\u00e0n h\u00e0ng v\u1ea1n \u0111i\u1ec3m s\u00e1ng nh\u1ecf h\u1ee3p th\u00e0nh. Lo\u1ea1i \u0111i\u1ec3m s\u00e1ng nh\u1ecf n\u00e0y g\u1ecdi l\u00e0 &#8220;ph\u1ea7n t\u1eed \u1ea3nh&#8221;. N\u00f3 do ch\u00f9m electron t\u1ed1c \u0111\u1ed9 cao, th\u00f4ng qua c\u01a1 c\u1ea5u qu\u00e9t, \u0111\u1eadp l\u00ean m\u00e0n hu\u1ef3nh quang m\u00e0 sinh ra. N\u1ebfu \u1edf g\u1ea7n m\u00e0n h\u00ecnh qu\u00e1, ph\u1ea7n t\u1eed \u1ea3nh tr\u00ean m\u00e0n hu\u1ef3nh quang \u0111\u1ec1u l\u1ed9 r\u00f5 ra h\u1ebft, h\u00ecnh \u1ea3nh nh\u00ecn v\u00e0o kh\u00f4ng n\u00e9t n\u1eefa.<\/p>\n\n\n\n<p>C\u00f2n m\u1ed9t nguy\u00ean nh\u00e2n kh\u00e1c, \u1edf g\u1ea7n m\u00e0n h\u00ecnh qu\u00e1, tia s\u00e1ng qu\u00e1 ch\u00f3i tr\u00ean m\u00e0n h\u00ecnh k\u00edch th\u00edch m\u1eaft s\u1ebd t\u1ed5n h\u1ea1i th\u1ecb l\u1ef1c. C\u00e1i \u0111\u00f3 c\u00f3 c\u00f9ng nguy\u00ean nh\u00e2n v\u1edbi vi\u1ec7c \u0111\u1ecdc s\u00e1ch d\u01b0\u1edbi \u00e1nh s\u00e1ng m\u1ea1nh.<\/p>\n\n\n\n<p>Ngo\u00e0i ra m\u1ed9t nguy\u00ean nh\u00e2n r\u1ea5t quan tr\u1ecdng n\u1eefa l\u00e0 \u1edf g\u1ea7n m\u00e0n h\u00ecnh tivi qu\u00e1, c\u01a1 th\u1ec3 ng\u01b0\u1eddi d\u1ec5 b\u1ecb b\u1ee9c x\u1ea1 c\u1ee7a tia X t\u1eeb tr\u00ean m\u00e0n h\u00ecnh r\u00f2 tho\u00e1t ra, l\u00e0m \u1ea3nh h\u01b0\u1edfng t\u1edbi s\u1ee9c kho\u1ebb.<\/p>\n\n\n\n<p>Khi tivi ho\u1ea1t \u0111\u1ed9ng, electron t\u1ed1c \u0111\u1ed9 cao \u0111\u1eadp v\u00e0o m\u00e0n hu\u1ef3nh quang c\u1ee7a \u0111\u00e8n hi\u1ec7n h\u00ecnh, s\u1ebd k\u00edch ph\u00e1t ra tia X t\u1eeb tr\u00ean m\u00e0n hu\u1ef3nh quang. K\u00edch th\u01b0\u1edbc \u0111\u00e8n hi\u1ec7n h\u00ecnh c\u00e0ng l\u1edbn, tia X s\u1ea3n sinh ra c\u0169ng c\u00e0ng nhi\u1ec1u, \u0111\u1eb7c bi\u1ec7t l\u00e0 tivi m\u00e0u.<\/p>\n\n\n\n<p>\u0110\u00e8n hi\u1ec7n h\u00ecnh c\u1ee7a tivi \u0111\u01b0\u1ee3c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">thi\u1ebft k\u1ebf<\/a> ch\u1ebf t\u1ea1o \u0111\u1eb7c bi\u1ec7t, trong v\u1ecf pha l\u00ea c\u1ee7a \u0111\u00e8n c\u00f3 \u0111\u01b0a v\u00e0o th\u00e0nh ph\u1ea7n ch\u00ec kim lo\u1ea1i c\u00f3 th\u1ec3 h\u1ea5p thu tia X, v\u1ecf pha l\u00ea c\u0169ng \u0111\u01b0\u1ee3c \u0111\u00fac d\u00e0y v\u00e0 ch\u1eafc \u0111\u1eb7c bi\u1ec7t, song v\u1eabn c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t ph\u1ea7n r\u1ea5t nh\u1ecf tia X r\u00f2 tho\u00e1t ra. Ng\u01b0\u1eddi c\u00e1ch xa m\u00e0n h\u00ecnh m\u1ed9t ch\u00fat, tia X chi\u1ebfu t\u1edbi s\u1ebd y\u1ebfu m\u1ed9t ch\u00fat. N\u1ebfu gi\u1eef \u0111\u01b0\u1ee3c kho\u1ea3ng c\u00e1ch th\u00edch h\u1ee3p v\u1edbi m\u00e0n h\u00ecnh th\u00ec tia X t\u1eeb m\u00e0n h\u00ecnh chi\u1ebfu t\u1edbi c\u01a1 th\u1ec3 ng\u01b0\u1eddi s\u1ebd nh\u1ecf kh\u00f4ng \u0111\u00e1ng k\u1ec3, kh\u00f4ng l\u00e0m t\u1ed5n h\u1ea1i s\u1ee9c kho\u1ebb \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<p>Ngo\u00e0i ra, khi xem truy\u1ec1n h\u00ecnh ngo\u00e0i vi\u1ec7c ph\u1ea3i gi\u1eef kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh ra, c\u00f2n ph\u1ea3i ch\u00fa \u00fd \u0111\u1ed9 cao c\u1ee7a m\u1eaft n\u00ean h\u01a1i cao h\u01a1n m\u00e0n h\u00ecnh, n\u00f3i chung v\u00e0o kho\u1ea3ng 3 &#8211; 5 cm tr\u00ean \u0111i\u1ec3m gi\u1eefa m\u00e0n h\u00ecnh, nh\u01b0 v\u1eady xem \u0111\u1ee1 m\u1ea5t s\u1ee9c, con m\u1eaft s\u1ebd kh\u00f4ng c\u1ea3m th\u1ea5y m\u1ec7t m\u1ecfi.<\/p>\n\n\n\n<p>T\u1eeb kho\u00e1: Tivi; \u0110\u00e8n hi\u1ec7n h\u00ecnh; M\u00e0n hu\u1ef3nh quang; Ph\u1ea7n t\u1eed \u1ea3nh; Tia X.<\/p>\n\n\n\n<p><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Kho\u1ea3ng c\u00e1ch c\u1ee7a tivi l\u00e0 ch\u1ec9 kho\u1ea3ng c\u00e1ch gi\u1eefa m\u1eaft ng\u01b0\u1eddi v\u1edbi \u0111i\u1ec3m gi\u1eefa c\u1ee7a m\u00e0n h\u00ecnh. Chi\u1ec1u d\u00e0i c\u1ee7a kho\u1ea3ng c\u00e1ch n\u00e0y ph\u1ea3i d\u1ef1a v\u00e0o k\u00edch th\u01b0\u1edbc m\u00e0n h\u00ecnh c\u1ee7a tivi m\u00e0 quy\u1ebft \u0111\u1ecbnh. Theo t\u00ednh to\u00e1n chung, kho\u1ea3ng c\u00e1ch n\u00e0y ph\u1ea3i g\u1ea5p 7 &#8211; 8 l\u1ea7n chi\u1ec1u cao c\u1ee7a m\u00e0n h\u00ecnh tivi. N\u1ebfu [&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":[15,7],"tags":[],"class_list":["post-5940","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5940","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=5940"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5940\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5940"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5940"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5940"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}