{"id":5902,"date":"2021-11-20T10:09:07","date_gmt":"2021-11-20T03:09:07","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=5902"},"modified":"2021-11-20T13:24:13","modified_gmt":"2021-11-20T06:24:13","slug":"vi-sao-lo-vi-song-khong-co-lua-ma-van-nau-chin-duoc-thuc-an","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vi-sao-lo-vi-song-khong-co-lua-ma-van-nau-chin-duoc-thuc-an\/","title":{"rendered":"V\u00ec sao l\u00f2 vi s\u00f3ng kh\u00f4ng c\u00f3 l\u1eeda m\u00e0 v\u1eabn n\u1ea5u ch\u00edn \u0111\u01b0\u1ee3c th\u1ee9c \u0103n?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">D\u00f9ng l\u00f2 vi s\u00f3ng n\u1ea5u ch\u00edn th\u1ee9c \u0103n ti\u1ec7n l\u1ee3i bi\u1ebft bao. B\u1ecf th\u1ee9c \u0103n s\u1ed1ng ho\u1eb7c l\u1ea1nh v\u00e0o l\u00f2 vi s\u00f3ng, \u0111\u00f3ng k\u00edn c\u1eeda l\u00f2, b\u1eadt c\u00f4ng t\u1eafc, m\u1ed9t l\u00e1t sau th\u1ee9c \u0103n trong l\u00f2 b\u1ecb \u0111un n\u00f3ng v\u00e0 ch\u00edn. Trong l\u00f2 vi s\u00f3ng kh\u00f4ng c\u00f3 l\u1eeda, l\u00e0m th\u1ebf n\u00e0o n\u1ea5u ch\u00edn th\u1ee9c \u0103n nh\u1ec9? \u0110i\u1ec1u \u0111\u00f3 ho\u00e0n to\u00e0n nh\u1edd v\u00e0o vi s\u00f3ng, t\u1ee9c l\u00e0 s\u00f3ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n, l\u00e0m t\u00e1c d\u1ee5ng ngu\u1ed3n nhi\u1ec7t cho l\u00f2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Vi s\u00f3ng l\u00e0 s\u00f3ng \u0111i\u1ec7n t\u1eeb c\u00f3 t\u1ea7n s\u1ed1 t\u1eeb 300 megahec \u0111\u1ebfn 300 ngh\u00ecn megahec. Tr\u00ean th\u1ef1c t\u1ebf, l\u00f2 vi s\u00f3ng l\u00e0 m\u1ed9t m\u00e1y ph\u00e1t vi s\u00f3ng, t\u1ea7n s\u1ed1 vi s\u00f3ng n\u00f3 sinh ra l\u00e0 2450 megahec. Lo\u1ea1i vi s\u00f3ng n\u00e0y c\u00f3 m\u1ed9t th\u00f3i quen h\u1ebft s\u1ee9c th\u00fa v\u1ecb. Khi g\u1eb7p th\u1ee9c \u0103n c\u00f3 ch\u1ee9a n\u01b0\u1edbc nh\u01b0 c\u00e1c lo\u1ea1i th\u1ecbt, tr\u1ee9ng, rau, vi s\u00f3ng s\u1ebd &#8220;\u1edf l\u1ea1i&#8221; \u0111\u00f3, v\u00e0 c\u00f2n &#8220;l\u00f4i ch\u1eb7t&#8221; ph\u00e2n t\u1eed n\u01b0\u1edbc trong th\u1ee9c \u0103n c\u00f9ng dao \u0111\u1ed9ng theo v\u1edbi t\u1ea7n s\u1ed1 c\u1ee7a n\u00f3. Dao \u0111\u1ed9ng c\u1ee7a ph\u00e2n t\u1eed n\u01b0\u1edbc trong th\u1ee9c \u0103n g\u00e2y n\u00ean s\u1ef1 ma s\u00e1t l\u1eabn nhau gi\u1eefa c\u00e1c ph\u00e2n t\u1eed, ma s\u00e1t l\u1ea1i sinh ra nhi\u1ec7t l\u01b0\u1ee3ng. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng c\u00e0ng l\u1edbn, ma s\u00e1t gi\u1eefa c\u00e1c ph\u00e2n t\u1eed c\u00e0ng m\u1ea1nh m\u1ebd, nhi\u1ec7t l\u01b0\u1ee3ng sinh ra t\u1ea5t nhi\u00ean c\u00e0ng nhi\u1ec1u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u1ea3i hi\u1ec3u r\u1eb1ng vi s\u00f3ng c\u00f3 t\u1ea7n s\u1ed1 2450 MHz, m\u1ed7i gi\u00e2y dao \u0111\u1ed9ng 2,45 t\u1ec9 l\u1ea7n. \u0110i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 ph\u00e2n t\u1eed n\u01b0\u1edbc trong th\u1ef1c ph\u1ea9m c\u0169ng theo vi s\u00f3ng m\u1ed7i gi\u00e2y dao \u0111\u1ed9ng 2,45 t\u1ec9 l\u1ea7n. Lo\u1ea1i dao \u0111\u1ed9ng n\u00e0y h\u1ea7u nh\u01b0 \u0111\u1ed3ng th\u1eddi x\u1ea3y ra \u1edf kh\u1eafp c\u00e1c ph\u1ea7n b\u00ean trong b\u00ean ngo\u00e0i c\u1ee7a th\u1ee9c \u0103n, v\u00ec v\u1eady th\u1ef1c ph\u1ea9m b\u1ecb n\u00f3ng l\u00ean s\u1ebd ch\u00edn \u0111\u1ec1u kh\u1eafp m\u1ecdi ch\u1ed7 trong ngo\u00e0i trong th\u1eddi gian r\u1ea5t ng\u1eafn. Nhi\u1ec7t \u0111\u1ed9 t\u0103ng l\u00ean \u0111\u1ebfn m\u1ee9c \u0111\u1ee7 \u0111\u1ec3 cho th\u1ef1c ph\u1ea9m t\u1eeb s\u1ed1ng bi\u1ebfn th\u00e0nh ch\u00edn, th\u1eadm ch\u00ed ch\u00e1y kh\u00f4. Tuy nhi\u00ean, d\u00f9ng vi s\u00f3ng gia nhi\u1ec7t cho th\u1ee9c \u0103n, ph\u1ea3i ch\u00fa \u00fd kh\u00f4ng \u0111\u01b0\u1ee3c \u0111\u1eb7t n\u00f3 v\u00e0o \u0111\u1ed3 \u0111\u1ef1ng b\u1eb1ng kim lo\u1ea1i. L\u00ed do r\u1ea5t \u0111\u01a1n gi\u1ea3n: vi s\u00f3ng g\u1eb7p kim lo\u1ea1i l\u1eadp t\u1ee9c ph\u1ea3n x\u1ea1 to\u00e0n b\u1ed9 tr\u1edf l\u1ea1i, N\u1ebfu \u0111\u1eb7t th\u1ee9c \u0103n v\u00e0o \u0111\u1ed3 \u0111\u1ef1ng b\u1eb1ng kim lo\u1ea1i, r\u1ed3i d\u00f9ng l\u00f2 vi s\u00f3ng gia nhi\u1ec7t, vi s\u00f3ng b\u1ecb kim lo\u1ea1i ph\u1ea3n x\u1ea1 l\u1ea1i to\u00e0n b\u1ed9, l\u00e0m sao n\u00f3ng l\u00ean v\u00e0 ch\u00edn \u0111\u01b0\u1ee3c? C\u1ed1 nhi\u00ean, tr\u00ean th\u1ef1c t\u1ebf kh\u00f4ng cho ph\u00e9p l\u00e0m nh\u01b0 v\u1eady, v\u00ec r\u1eb1ng kh\u00f4ng ch\u1edd \u0111\u1ebfn khi b\u1ea1n tr\u00f4ng th\u1ea5y k\u1ebft qu\u1ea3 th\u00ec l\u00f2 vi s\u00f3ng \u0111\u00e3 b\u1ecb ch\u00e1y ti\u00eau r\u1ed3i. \u0110\u00f3 l\u00e0 v\u00ec vi s\u00f3ng cao t\u1ea7n ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i to\u00e0n b\u1ed9 kh\u00f4ng h\u1ec1 b\u1ecb ti\u00eau hao ch\u00fat n\u00e0o, trong k\u0129 thu\u1eadt \u0111i\u1ec7n t\u1eed g\u1ecdi l\u00e0 ch\u1eadp m\u1ea1ch cao t\u1ea7n, h\u1eadu qu\u1ea3 l\u00e0 l\u00e0m cho anot c\u1ee7a \u0111\u00e8n \u0111i\u1ec7n t\u1eed ph\u00e1t ra vi s\u00f3ng sinh ra nhi\u1ec7t \u0111\u1ed9 cao, \u0111\u1ebfn n\u1ed7i b\u1ecb ch\u00e1y \u0111\u1ecf h\u1ecfng \u0111i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1eafm \u0111\u01b0\u1ee3c t\u00ednh ch\u1ea5t c\u1ee7a vi s\u00f3ng, c\u00f3 th\u1ec3 d\u00f9ng n\u00f3 \u0111\u1ec3 d\u00f9ng \u0111\u1ed3 \u0111\u1ef1ng th\u1ee9c \u0103n ch\u1ebf t\u1ea1o b\u1eb1ng v\u1eadt li\u1ec7u s\u00e0nh s\u1ee9, thu\u1ef7 tinh ch\u1ecbu nhi\u1ec7t v.v. N\u1ebfu th\u1eddi gian gia nhi\u1ec7t kh\u00f4ng qu\u00e1 d\u00e0i, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ed3 \u0111\u1ef1ng th\u1ee9c \u0103n b\u1eb1ng nh\u1ef1a, th\u1eadm ch\u00ed b\u1eb1ng gi\u1ea5y. \u0110\u1ed3 \u0111\u1ef1ng tr\u00e1ng men gi\u1ed1ng nh\u01b0 b\u1eb1ng s\u1ee9, k\u00ec th\u1ef1c trong ru\u1ed9t n\u00f3 l\u00e0 v\u1eadt li\u1ec7u s\u1eaft, c\u1ed1 nhi\u00ean c\u0169ng kh\u00f4ng th\u1ec3 d\u00f9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb kh\u00f3a: L\u00f2 vi s\u00f3ng; Vi s\u00f3ng; Ch\u1eadp m\u1ea1ch cao t\u1ea7n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>D\u00f9ng l\u00f2 vi s\u00f3ng n\u1ea5u ch\u00edn th\u1ee9c \u0103n ti\u1ec7n l\u1ee3i bi\u1ebft bao. B\u1ecf th\u1ee9c \u0103n s\u1ed1ng ho\u1eb7c l\u1ea1nh v\u00e0o l\u00f2 vi s\u00f3ng, \u0111\u00f3ng k\u00edn c\u1eeda l\u00f2, b\u1eadt c\u00f4ng t\u1eafc, m\u1ed9t l\u00e1t sau th\u1ee9c \u0103n trong l\u00f2 b\u1ecb \u0111un n\u00f3ng v\u00e0 ch\u00edn. Trong l\u00f2 vi s\u00f3ng kh\u00f4ng c\u00f3 l\u1eeda, l\u00e0m th\u1ebf n\u00e0o n\u1ea5u ch\u00edn th\u1ee9c \u0103n [&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-5902","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\/5902","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=5902"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5902\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5902"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5902"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5902"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}