{"id":5630,"date":"2021-11-20T09:37:43","date_gmt":"2021-11-20T02:37:43","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=5630"},"modified":"2021-11-20T12:41:09","modified_gmt":"2021-11-20T05:41:09","slug":"vi-sao-khi-bay-voi-toc-do-sieu-thanh-may-bay-lai-phat-ra-tieng-no-to-nhu-sam","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/vi-sao-khi-bay-voi-toc-do-sieu-thanh-may-bay-lai-phat-ra-tieng-no-to-nhu-sam\/","title":{"rendered":"V\u00ec sao khi bay v\u1edbi t\u1ed1c \u0111\u1ed9 si\u00eau thanh, m\u00e1y bay l\u1ea1i ph\u00e1t ra ti\u1ebfng n\u1ed5 to nh\u01b0 s\u1ea5m?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u00c2m thanh l\u00e0 m\u1ed9t lo\u1ea1i s\u00f3ng. Trong qu\u00e1 tr\u00ecnh truy\u1ec1n lan c\u1ee7a s\u00f3ng \u00e2m thanh, gi\u1eefa kh\u00f4ng kh\u00ed \u0111\u00e3 b\u1ecb x\u00e1o \u0111\u1ed9ng v\u00e0 kh\u00f4ng kh\u00ed ch\u01b0a b\u1ecb x\u00e1o \u0111\u1ed9ng c\u00f3 m\u1ed9t m\u1eb7t ph\u00e2n c\u00e1ch, m\u00e0 ch\u00fang ta g\u1ecdi l\u00e0 m\u1eb7t \u0111\u1ea7u s\u00f3ng. N\u1ebfu ngu\u1ed3n \u00e2m thanh \u0111\u1ee9ng y\u00ean th\u00ec m\u1eb7t \u0111\u1ea7u s\u00f3ng l\u00e0 m\u1ed9t m\u1eb7t c\u1ea7u to\u1ea3 ra ph\u00eda ngo\u00e0i, m\u1eb7t c\u1eaft th\u1eb3ng \u0111\u1ee9ng c\u1ee7a n\u00f3 l\u00e0 m\u1ed9t h\u00ecnh tr\u00f2n. N\u1ebfu ngu\u1ed3n \u00e2m thanh chuy\u1ec3n \u0111\u1ed9ng, v\u00e0 t\u1ed1c \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a n\u00f3 v\u01b0\u1ee3t qu\u00e1 t\u1ed1c \u0111\u1ed9 \u00e2m thanh, m\u1eb7c d\u00f9 \u1edf m\u1ed7i th\u1eddi \u0111i\u1ec3m ngu\u1ed3n \u00e2m thanh v\u1eabn ph\u00e1t s\u00f3ng h\u00ecnh tr\u00f2n ra ngo\u00e0i, nh\u01b0ng nh\u1eefng s\u00f3ng h\u00ecnh tr\u00f2n \u0111\u00f3 l\u1ea1i t\u1ee5 t\u1eadp th\u00e0nh m\u1eb7t \u0111\u1ea7u s\u00f3ng h\u00ecnh \u0111\u01b0\u1eddng th\u1eb3ng, c\u0169ng c\u00f3 ngh\u0129a l\u00e0 m\u1eb7t \u0111\u1ea7u s\u00f3ng kh\u00f4ng c\u00f2n l\u00e0 h\u00ecnh tr\u00f2n n\u1eefa. Khi \u1ea5y s\u1ebd sinh ra hi\u1ec7n t\u01b0\u1ee3ng \u00e2m h\u1ecdc d\u1ecb th\u01b0\u1eddng, g\u1ecdi l\u00e0 ti\u1ebfng n\u1ed5 \u00e2m thanh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi m\u00e1y bay bay v\u1edbi t\u1ed1c \u0111\u1ed9 si\u00eau thanh, t\u1ea1i c\u00e1c n\u01a1i nh\u01b0 \u0111\u1ea7u, c\u00e1nh, \u0111u\u00f4i m\u00e1y bay, v.v. \u0111\u1ec1u c\u00f3 th\u1ec3 l\u00e0m cho kh\u00f4ng kh\u00ed xung quanh sinh ra s\u1ef1 bi\u1ebfn \u0111\u1ed5i \u00e1p su\u1ea5t \u0111\u1ed9t ng\u1ed9t, sinh ra s\u00f3ng xung k\u00edch tr\u01b0\u1edbc v\u00e0 s\u00f3ng xung k\u00edch sau r\u1ea5t m\u1ea1nh. C\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a hai lo\u1ea1i s\u00f3ng n\u00e0y \u0111\u1ec1u r\u1ea5t l\u1edbn. Khi s\u00f3ng xung k\u00edch tr\u01b0\u1edbc \u0111i qua, \u00e1p su\u1ea5t kh\u00f4ng kh\u00ed \u0111\u1ed9t nhi\u00ean t\u0103ng cao, sau \u0111\u00f3 \u00e1p su\u1ea5t \u1ed5n \u0111\u1ecbnh l\u1ea1i v\u00e0 h\u1ea1 th\u1ea5p, \u0111\u1ebfn m\u1ee9c th\u1ea5p h\u01a1n \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n. Ti\u1ebfp \u0111\u1ebfn, khi s\u00f3ng xung k\u00edch sau \u0111i qua, \u00e1p su\u1ea5t l\u1ea1i \u0111\u1ed9t nhi\u00ean t\u0103ng l\u00ean v\u00e0 d\u1ea7n d\u1ea7n kh\u00f4i ph\u1ee5c \u0111\u1ebfn \u00e1p su\u1ea5t kh\u00ed quy\u1ec3n. Qu\u00e3ng c\u00e1ch th\u1eddi gian \u0111i qua c\u1ee7a hai s\u00f3ng xung k\u00edch tr\u01b0\u1edbc v\u00e0 sau kho\u1ea3ng 0,12 &#8211; 0,22 gi\u00e2y. N\u1ebfu \u0111\u1ed9 cao bay c\u1ee7a m\u00e1y bay kh\u00f4ng l\u1edbn l\u1eafm, trong kho\u1ea3nh kh\u1eafc khi s\u00f3ng xung k\u00edch \u0111i qua, ta c\u00f3 th\u1ec3 nghe th\u1ea5y nh\u01b0 ti\u1ebfng s\u1ea5m gi\u1eefa tr\u1eddi quang ho\u1eb7c nh\u01b0 ti\u1ebfng \u0111\u1ea1n \u0111\u1ea1i b\u00e1c n\u1ed5. \u0110\u00f3 l\u00e0 ti\u1ebfng n\u1ed5 \u00e2m thanh do m\u00e1y bay khi bay v\u1edbi t\u1ed1c \u0111\u1ed9 si\u00eau \u00e2m sinh ra. V\u00ec c\u00f3 hai s\u00f3ng xung k\u00edch tr\u01b0\u1edbc v\u00e0 sau, n\u00ean ch\u00fang ta c\u00f3 th\u1ec3 nghe th\u1ea5y hai ti\u1ebfng n\u1ed5 \u00e2m thanh \u0111anh g\u1ecdn m\u00e0 d\u1eef d\u1ed9i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ti\u1ebfng n\u1ed5 \u00e2m thanh c\u00f3 quan h\u1ec7 v\u1edbi \u0111\u1ed9 cao v\u00e0 t\u1ed1c \u0111\u1ed9 bay. C\u00f9ng m\u1ed9t t\u1ed1c \u0111\u1ed9 bay, \u0111\u1ed9 cao bay c\u00e0ng th\u1ea5p, \u1ea3nh h\u01b0\u1edfng c\u1ee7a s\u00f3ng xung k\u00edch \u0111\u1ed1i v\u1edbi m\u1eb7t \u0111\u1ea5t c\u00e0ng m\u1ea1nh, v\u00e0 ng\u01b0\u1ee3c l\u1ea1i th\u00ec y\u1ebfu. C\u0169ng nh\u01b0 v\u1eady, \u1edf \u0111\u1ed9 cao nh\u01b0 nhau, t\u1ed1c \u0111\u1ed9 bay c\u00e0ng nhanh, s\u00f3ng xung k\u00edch c\u00e0ng m\u1ea1nh, v\u00e0 ng\u01b0\u1ee3c l\u1ea1i th\u00ec nh\u1ecf. N\u1ebfu bay v\u1edbi t\u1ed1c \u0111\u1ed9 si\u00eau thanh \u1edf \u0111\u1ed9 cao th\u1ea5p, ti\u1ebfng n\u1ed5 \u00e2m thanh sinh ra th\u1eadm ch\u00ed c\u00f3 th\u1ec3 \u0111\u00e1nh s\u1eadp c\u00f4ng tr\u00ecnh ki\u1ebfn tr\u00fac. V\u00ec v\u1eady, trong t\u00ecnh h\u00ecnh chung, m\u00e1y bay bay v\u1edbi t\u1ed1c \u0111\u1ed9 si\u00eau thanh kh\u00f4ng \u0111\u01b0\u1ee3c th\u1ea5p qu\u00e1 \u0111\u1ed9 cao quy \u0111\u1ecbnh. L\u00e0m nh\u01b0 v\u1eady m\u1edbi c\u00f3 th\u1ec3 gi\u1ea3m y\u1ebfu \u1ea3nh h\u01b0\u1edfng \u0111\u1ed1i v\u1edbi m\u1eb7t \u0111\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb kh\u00f3a: M\u00e1y bay si\u00eau thanh; M\u1eb7t \u0111\u1ea7u s\u00f3ng; Ti\u1ebfng n\u1ed5 \u00e2m thanh.<\/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 m\u1ed9t lo\u1ea1i s\u00f3ng. Trong qu\u00e1 tr\u00ecnh truy\u1ec1n lan c\u1ee7a s\u00f3ng \u00e2m thanh, gi\u1eefa kh\u00f4ng kh\u00ed \u0111\u00e3 b\u1ecb x\u00e1o \u0111\u1ed9ng v\u00e0 kh\u00f4ng kh\u00ed ch\u01b0a b\u1ecb x\u00e1o \u0111\u1ed9ng c\u00f3 m\u1ed9t m\u1eb7t ph\u00e2n c\u00e1ch, m\u00e0 ch\u00fang ta g\u1ecdi l\u00e0 m\u1eb7t \u0111\u1ea7u s\u00f3ng. N\u1ebfu ngu\u1ed3n \u00e2m thanh \u0111\u1ee9ng y\u00ean th\u00ec m\u1eb7t \u0111\u1ea7u s\u00f3ng l\u00e0 m\u1ed9t m\u1eb7t [&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-5630","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\/5630","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=5630"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5630\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}