{"id":5634,"date":"2021-11-20T09:38:11","date_gmt":"2021-11-20T02:38:11","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=5634"},"modified":"2021-11-20T12:41:09","modified_gmt":"2021-11-20T05:41:09","slug":"vi-sao-khi-xe-lua-chay-toi-gan-tieng-coi-nghe-rit-choi-con-khi-chay-xa-ra-thi-bien-thanh-tieng-tram-khan","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vi-sao-khi-xe-lua-chay-toi-gan-tieng-coi-nghe-rit-choi-con-khi-chay-xa-ra-thi-bien-thanh-tieng-tram-khan\/","title":{"rendered":"V\u00ec sao khi xe l\u1eeda ch\u1ea1y t\u1edbi g\u1ea7n, ti\u1ebfng c\u00f2i nghe r\u00edt ch\u00f3i, c\u00f2n khi ch\u1ea1y xa ra th\u00ec bi\u1ebfn th\u00e0nh ti\u1ebfng tr\u1ea7m kh\u00e0n?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Gi\u1edbi t\u1ef1 nhi\u00ean c\u00f3 l\u1eafm ki\u1ec3u nhi\u1ec1u d\u1ea1ng \u00e2m thanh, c\u00f3 \u00e2m cao, \u00e2m th\u1ea5p. Ch\u00fang ta n\u00f3i \u00e2m \u0111i\u1ec7u c\u1ee7a ch\u00fang kh\u00e1c nhau. \u00c2m thanh c\u00f3 \u00e2m \u0111i\u1ec7u cao, t\u1ea7n s\u1ed1 rung \u0111\u1ed9ng cao; v\u00ed d\u1ee5 nh\u01b0 \u00e2m thanh c\u1ee7a c\u00e2y s\u00e1o, \u00e2m \u0111i\u1ec7u cao, nghe t\u01b0\u01a1ng \u0111\u1ed1i s\u1eafc. \u00c2m thanh c\u00f3 \u00e2m \u0111i\u1ec7u th\u1ea5p, t\u1ea7n s\u1ed1 rung \u0111\u1ed9ng th\u1ea5p; v\u00ed d\u1ee5 nh\u01b0 ti\u1ebfng tr\u1ed1ng, \u00e2m \u0111i\u1ec7u th\u1ea5p, nghe t\u01b0\u01a1ng \u0111\u1ed1i tr\u1ea7m tr\u1ea7m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c2m \u0111i\u1ec7u c\u1ee7a c\u00f2i xe l\u1eeda l\u1ebd ra ph\u1ea3i c\u1ed1 \u0111\u1ecbnh. Song, ng\u01b0\u1eddi tinh t\u1ebf s\u1ebd ph\u00e1t hi\u1ec7n, khi xe l\u1eeda ch\u1ea1y \u0111\u1ebfn g\u1ea7n, ti\u1ebfng c\u00f2i nghe ch\u00f3i m\u1ed9t ch\u00fat, c\u0169ng c\u00f3 ngh\u0129a l\u00e0 \u00e2m \u0111i\u1ec7u cao l\u00ean m\u1ed9t ch\u00fat. Sau khi \u0111i xa, ti\u1ebfng c\u00f2i bi\u1ebfn th\u00e0nh tr\u1ea7m m\u1ed9t ch\u00fat, c\u0169ng c\u00f3 ngh\u0129a l\u00e0 \u00e2m \u0111i\u1ec7u th\u1ea5p xu\u1ed1ng m\u1ed9t ch\u00fat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ec nguy\u00ean nh\u00e2n g\u00ec v\u1eady?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ea5u ch\u1ed1t c\u1ee7a v\u1ea5n \u0111\u1ec1 l\u00e0 \u1edf ch\u1ed7, gi\u1eefa ngu\u1ed3n \u00e2m thanh v\u00e0 ng\u01b0\u1eddi quan s\u00e1t c\u00f3 s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i. Ti\u1ebfng c\u00f2i v\u1ed1n c\u00f3 m\u1ed9t t\u1ea7n s\u1ed1 nh\u1ea5t \u0111\u1ecbnh. S\u1ef1 &#8220;th\u01b0a&#8221; v\u00e0 &#8220;d\u00e0y&#8221; trong s\u00f3ng \u00e2m \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo m\u1ed9t kho\u1ea3ng c\u00e1ch nh\u1ea5t \u0111\u1ecbnh. Khi xe l\u1eeda ch\u1ea1y v\u1ec1 ph\u00eda b\u1ea1n, s\u1ef1 &#8220;th\u01b0a&#8221; v\u00e0 &#8220;d\u00e0y&#8221; c\u1ee7a s\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed b\u1ecb n\u00f3 \u00e9p ch\u1eb7t h\u01a1n, kho\u1ea3ng c\u00e1ch gi\u1eefa &#8220;th\u01b0a&#8221; v\u00e0 &#8220;d\u00e0y&#8221; c\u00e0ng g\u1ea7n h\u01a1n. V\u00ec v\u1eady, so v\u1edbi ng\u01b0\u1eddi quan s\u00e1t th\u00ec t\u1ea7n s\u1ed1 rung \u0111\u1ed9ng c\u1ee7a \u00e2m thanh c\u00e0ng nhanh l\u00ean, \u00e2m \u0111i\u1ec7u c\u0169ng cao l\u00ean, \u00e2m thanh nghe th\u1ea5y ch\u00f3i h\u01a1n m\u1ed9t ch\u00fat. Khi xe l\u1eeda r\u1eddi kh\u1ecfi b\u1ea1n, n\u00f3 k\u00e9o s\u1ef1 &#8220;th\u01b0a&#8221; v\u00e0 &#8220;d\u00e0y&#8221; c\u1ee7a s\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed gi\u00e3n ra. Kho\u1ea3ng c\u00e1ch gi\u1eefa &#8220;th\u01b0a&#8221; v\u00e0 &#8220;d\u00e0y&#8221; xa nhau h\u01a1n. V\u00ec v\u1eady, so v\u1edbi ng\u01b0\u1eddi quan s\u00e1t th\u00ec t\u1ea7n s\u1ed1 rung \u0111\u1ed9ng c\u1ee7a \u00e2m thanh gi\u1ea3m ch\u1eadm l\u1ea1i, \u00e2m \u0111i\u1ec7u c\u0169ng th\u1ea5p xu\u1ed1ng, \u00e2m thanh nghe th\u1ea5y tr\u1edf n\u00ean tr\u1ea7m kh\u00e0n. T\u1ed1c \u0111\u1ed9 c\u1ee7a xe l\u1eeda c\u00e0ng nhanh, s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a \u00e2m \u0111i\u1ec7u c\u0169ng c\u00e0ng l\u1edbn. C\u00f4ng nh\u00e2n \u0111\u01b0\u1eddng s\u1eaft ng\u00e0y ng\u00e0y ti\u1ebfp x\u00fac v\u1edbi xe l\u1eeda \u0111\u00e3 c\u00f3 nhi\u1ec1u kinh nghi\u1ec7m v\u1ec1 m\u1eb7t n\u00e0y. H\u1ecd c\u00f3 th\u1ec3 d\u1ef1a v\u00e0o s\u1ef1 bi\u1ebfn \u0111\u1ed5i c\u1ee7a \u00e2m \u0111i\u1ec7u c\u1ee7a ti\u1ebfng c\u00f2i m\u00e0 \u0111o\u00e1n ra t\u1ed1c \u0111\u1ed9 v\u00e0 h\u01b0\u1edbng ch\u1ea1y c\u1ee7a xe ho\u1ea3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong khoa h\u1ecdc, khi gi\u1eefa ngu\u1ed3n s\u00f3ng v\u00e0 ng\u01b0\u1eddi quan s\u00e1t c\u00f3 chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i, hi\u1ec7n t\u01b0\u1ee3ng t\u1ea7n s\u1ed1 thu \u0111\u01b0\u1ee3c c\u1ee7a ng\u01b0\u1eddi quan s\u00e1t kh\u00e1c v\u1edbi t\u1ea7n s\u1ed1 ph\u00e1t ra c\u1ee7a ngu\u1ed3n s\u00f3ng g\u1ecdi l\u00e0 hi\u1ec7u \u1ee9ng Doppler. S\u1ef1 bi\u1ebfn \u0111\u1ed5i \u00e2m \u0111i\u1ec7u c\u1ee7a c\u00f2i xe l\u1eeda l\u00e0 m\u1ed9t v\u00ed d\u1ee5 th\u1ef1c c\u1ee7a hi\u1ec7u \u1ee9ng Doppler.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong thi\u00ean v\u0103n, d\u1ef1a v\u00e0o hi\u1ec7u \u1ee9ng Doppler c\u00f3 th\u1ec3 t\u00ednh to\u00e1n ch\u00ednh x\u00e1c \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 c\u1ee7a thi\u00ean th\u1ec3 so v\u1edbi Tr\u00e1i \u0110\u1ea5t. T\u1ed1c \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1ec7 tinh nh\u00e2n t\u1ea1o c\u0169ng \u0111\u01b0\u1ee3c \u0111o \u0111\u1ea1c b\u1eb1ng c\u00e1ch l\u1ee3i d\u1ee5ng hi\u1ec7u \u1ee9ng Doppler. T\u1ed1c \u0111\u1ed9 m\u00e1u ch\u1ea3y trong huy\u1ebft qu\u1ea3n con ng\u01b0\u1eddi c\u0169ng c\u00f3 th\u1ec3 l\u1ee3i d\u1ee5ng hi\u1ec7u \u1ee9ng Doppler \u0111\u1ec3 \u0111o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb kh\u00f3a: Xe l\u1eeda; \u00c2m thanh; \u00c2m \u0111i\u1ec7u; Hi\u1ec7u \u1ee9ng Doppler.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Gi\u1edbi t\u1ef1 nhi\u00ean c\u00f3 l\u1eafm ki\u1ec3u nhi\u1ec1u d\u1ea1ng \u00e2m thanh, c\u00f3 \u00e2m cao, \u00e2m th\u1ea5p. Ch\u00fang ta n\u00f3i \u00e2m \u0111i\u1ec7u c\u1ee7a ch\u00fang kh\u00e1c nhau. \u00c2m thanh c\u00f3 \u00e2m \u0111i\u1ec7u cao, t\u1ea7n s\u1ed1 rung \u0111\u1ed9ng cao; v\u00ed d\u1ee5 nh\u01b0 \u00e2m thanh c\u1ee7a c\u00e2y s\u00e1o, \u00e2m \u0111i\u1ec7u cao, nghe t\u01b0\u01a1ng \u0111\u1ed1i s\u1eafc. \u00c2m thanh c\u00f3 \u00e2m \u0111i\u1ec7u [&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-5634","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\/5634","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=5634"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5634\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5634"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5634"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}