{"id":5616,"date":"2021-11-20T09:36:07","date_gmt":"2021-11-20T02:36:07","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=5616"},"modified":"2021-11-20T12:41:10","modified_gmt":"2021-11-20T05:41:10","slug":"5616","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/5616\/","title":{"rendered":"V\u00ec sao t\u1ed1c \u0111\u1ed9 truy\u1ec1n c\u1ee7a \u00e2m thanh trong n\u01b0\u1edbc l\u1ea1i nhanh h\u01a1n trong kh\u00f4ng kh\u00ed?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u00c2m thanh l\u00e0 th\u1ee9 nh\u00ecn kh\u00f4ng th\u1ea5y, s\u1edd c\u0169ng kh\u00f4ng th\u1ea5y, v\u1eady m\u00e0 tai c\u1ee7a ch\u00fang ta l\u1ea1i c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c n\u00f3. \u00c2m thanh do rung \u0111\u1ed9ng c\u1ee7a v\u1eadt th\u1ec3 g\u00e2y ra. Khi v\u1eadt th\u1ec3 x\u1ea3y ra ch\u1ea5n \u0111\u1ed9ng, n\u00f3 s\u1ebd truy\u1ec1n ch\u1ea5n \u0111\u1ed9ng c\u1ee7a m\u00ecnh cho kh\u00f4ng kh\u00ed s\u00e1t b\u00ean c\u1ea1nh, l\u00e0m cho c\u00e1c ph\u00e2n t\u1eed trong kh\u00f4ng kh\u00ed c\u0169ng ch\u1ea5n \u0111\u1ed9ng, r\u1ed3i k\u00e9o kh\u00f4ng kh\u00ed \u1edf ph\u00eda tr\u01b0\u1edbc c\u0169ng ch\u1ea5n \u0111\u1ed9ng theo. C\u1ee9 nh\u01b0 v\u1eady m\u00e0 d\u1ea7n d\u1ea7n truy\u1ec1n \u0111\u1ebfn tai ng\u01b0\u1eddi. M\u00e0ng nh\u0129 trong tai ng\u01b0\u1eddi c\u0169ng theo \u0111\u00f3 m\u00e0 ch\u1ea5n \u0111\u1ed9ng v\u00e0 ng\u01b0\u1eddi nghe th\u1ea5y \u00e2m thanh. V\u00ec v\u1eady kh\u00f4ng kh\u00ed c\u00f3 th\u1ec3 truy\u1ec1n \u00e2m thanh. Trong ch\u00e2n kh\u00f4ng, \u00e2m thanh kh\u00f4ng c\u00f3 c\u00e1ch n\u00e0o truy\u1ec1n \u0111i \u0111\u01b0\u1ee3c. \u0110\u1ee9ng tr\u00ean M\u1eb7t Tr\u0103ng, cho d\u00f9 c\u00f3 ng\u01b0\u1eddi g\u00e0o to tr\u01b0\u1edbc m\u1eb7t b\u1ea1n th\u00ec b\u1ea1n c\u0169ng kh\u00f4ng nghe th\u1ea5y m\u1ed9t ch\u00fat x\u00edu \u00e2m thanh n\u00e0o, v\u00ec tr\u00ean M\u1eb7t Tr\u0103ng kh\u00f4ng c\u00f3 kh\u00f4ng kh\u00ed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ngo\u00e0i kh\u00f4ng kh\u00ed c\u00f3 th\u1ec3 truy\u1ec1n \u00e2m thanh ra, nhi\u1ec1u th\u1ee9 nh\u01b0 ch\u1ea5t l\u1ecfng, ch\u1ea5t r\u1eafn v.v. \u0111\u1ec1u c\u00f3 th\u1ec3 truy\u1ec1n \u00e2m thanh. Khi c\u00f3 ng\u01b0\u1eddi \u0111i tr\u00ean b\u1edd s\u00f4ng, c\u00e1 d\u01b0\u1edbi s\u00f4ng v\u1eeba nghe th\u1ea5y ti\u1ebfng ch\u00e2n ng\u01b0\u1eddi li\u1ec1n l\u1eadp t\u1ee9c \u1ea9n tr\u1ed1n. \u0110\u00f3 l\u00e0 do n\u01b0\u1edbc truy\u1ec1n \u00e2m thanh. N\u01b0\u1edbc ch\u1eb3ng nh\u1eefng c\u00f3 th\u1ec3 truy\u1ec1n \u00e2m thanh, m\u00e0 t\u1ed1c \u0111\u1ed9 truy\u1ec1n c\u1ee7a n\u00f3 c\u00f2n nhanh h\u01a1n kh\u00f4ng kh\u00ed nhi\u1ec1u. C\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u00e3 \u0111o \u0111\u01b0\u1ee3c, \u1edf 0 \u00b0C, t\u1ed1c \u0111\u1ed9 truy\u1ec1n trong n\u01b0\u1edbc l\u00e0 1450 m\/s. V\u00ec sao \u00e2m thanh truy\u1ec1n trong n\u01b0\u1edbc l\u1ea1i nhanh h\u01a1n trong kh\u00f4ng kh\u00ed?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nguy\u00ean nh\u00e2n t\u1ed1c \u0111\u1ed9 truy\u1ec1n c\u1ee7a \u00e2m thanh c\u00f3 quan h\u1ec7 ch\u1eb7t ch\u1ebd v\u1edbi t\u00ednh ch\u1ea5t c\u1ee7a m\u00f4i tr\u01b0\u1eddng. Trong qu\u00e1 tr\u00ecnh truy\u1ec1n \u00e2m thanh, c\u00e1c ph\u00e2n t\u1eed c\u1ee7a m\u00f4i tr\u01b0\u1eddng l\u1ea7n l\u01b0\u1ee3t dao \u0111\u1ed9ng quanh v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng c\u1ee7a n\u00f3. Khi m\u1ed9t ph\u00e2n t\u1eed n\u00e0o \u0111\u00f3 l\u1ec7ch kh\u1ecfi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng, c\u00e1c ph\u00e2n t\u1eed kh\u00e1c \u1edf xung quanh li\u1ec1n l\u00f4i n\u00f3 tr\u1edf v\u1ec1 v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng. \u0110i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0, ph\u00e2n t\u1eed m\u00f4i tr\u01b0\u1eddng c\u00f3 n\u0103ng l\u1ef1c ch\u1ed1ng l\u1ea1i s\u1ef1 l\u1ec7ch kh\u1ecfi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng. Kh\u00f4ng kh\u00ed v\u00e0 n\u01b0\u1edbc \u0111\u1ec1u l\u00e0 m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m thanh, ph\u00e2n t\u1eed m\u00f4i tr\u01b0\u1eddng kh\u00e1c nhau, kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u0169ng kh\u00e1c nhau. M\u00f4i tr\u01b0\u1eddng c\u00f3 kh\u1ea3 n\u0103ng ph\u1ea3n kh\u00e1ng l\u1edbn, kh\u1ea3 n\u0103ng truy\u1ec1n dao \u0111\u1ed9ng c\u0169ng l\u1edbn, t\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m thanh s\u1ebd nhanh. Kh\u1ea3 n\u0103ng ch\u1ed1ng l\u1ea1i c\u1ee7a ph\u00e2n t\u1eed n\u01b0\u1edbc l\u1edbn h\u01a1n c\u1ee7a kh\u00f4ng kh\u00ed, cho n\u00ean t\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m thanh trong n\u01b0\u1edbc nhanh h\u01a1n trong kh\u00f4ng kh\u00ed. Nguy\u00ean t\u1eed s\u1eaft c\u00f3 n\u0103ng l\u1ef1c ch\u1ed1ng l\u1ea1i c\u00f2n l\u1edbn h\u01a1n c\u1ee7a ph\u00e2n t\u1eed n\u01b0\u1edbc, cho n\u00ean t\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m thanh trong s\u1eaft th\u00e9p l\u1ea1i c\u00e0ng l\u1edbn, \u0111\u1ea1t \u0111\u01b0\u1ee3c 5000 m\/s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb kh\u00f3a: Ti\u1ebfng n\u1ed5; Vi\u00ean \u0111\u1ea1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>\u00c2m thanh l\u00e0 th\u1ee9 nh\u00ecn kh\u00f4ng th\u1ea5y, s\u1edd c\u0169ng kh\u00f4ng th\u1ea5y, v\u1eady m\u00e0 tai c\u1ee7a ch\u00fang ta l\u1ea1i c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c n\u00f3. \u00c2m thanh do rung \u0111\u1ed9ng c\u1ee7a v\u1eadt th\u1ec3 g\u00e2y ra. Khi v\u1eadt th\u1ec3 x\u1ea3y ra ch\u1ea5n \u0111\u1ed9ng, n\u00f3 s\u1ebd truy\u1ec1n ch\u1ea5n \u0111\u1ed9ng c\u1ee7a m\u00ecnh cho kh\u00f4ng kh\u00ed s\u00e1t b\u00ean c\u1ea1nh, l\u00e0m cho [&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-5616","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\/5616","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=5616"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5616\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}