T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm: H\u00e3y Tr\u1ea3 L\u1eddi Em T\u1ea1i Sao? \u2013 T\u1eadp 9 – Arkady Leokum<\/p>\n\n\n\n
Ch\u00fang ta h\u00e3y b\u1eaft \u0111\u1ea7u b\u1eb1ng ti\u1ebfng d\u1ed9i. Khi m\u1ed9t \u00e2m thanh b\u1ecb d\u1ed9i ng\u01b0\u1ee3c tr\u1edf l\u1ea1i do g\u1eb7p v\u1eadt c\u1ea3n qu\u00e1 l\u1edbn, ta g\u1ecdi \u00e2m thanh tr\u1edf v\u1ec1 \u0111\u00f3 l\u00e0 ti\u1ebfng d\u1ed9i. Khi m\u1ed9t t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn b\u1ecb d\u1ed9i ng\u01b0\u1ee3c tr\u1edf l\u1ea1i v\u00ec m\u1ed9t v\u1eadt c\u1ea3n, ta g\u1ecdi t\u00edn hi\u1ec7u tr\u1edf v\u1ec1 l\u00e0 ti\u1ebfng d\u1ed9i v\u00f4 tuy\u1ebfn. S\u1ea3n xu\u1ea5t v\u00e0 ti\u1ebfp nh\u1eadn nh\u1eefng ti\u1ebfng v\u1ecdng v\u00f4 tuy\u1ebfn g\u1ecdi l\u00e0 rada.<\/p>\n\n\n\n
M\u1ed9t b\u1ed9 m\u00e1y rada s\u1ea3n xu\u1ea5t nh\u1eefng t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn. Rada g\u1edfi nh\u1eefng t\u00edn hi\u1ec7u v\u00e0o kh\u00f4ng gian nh\u1edd m\u1ed9t c\u1ea7n \u0103ng ten. Khi m\u1ed9t t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn \u0111\u1ee5ng ph\u1ea3i m\u1ed9t v\u1eadt, m\u1ed9t ph\u1ea7n c\u1ee7a t\u00edn hi\u1ec7u d\u1ed9i ng\u01b0\u1ee3c l\u1ea1i qua \u0103ng ten rada. T\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c nh\u1eadn \u1edf \u0111\u1ea5y nh\u01b0 l\u00e0 m\u1ed9t ti\u1ebfng d\u1ed9i rada. M\u00e1y rada chuy\u1ec3n ti\u1ebfng d\u1ed9i rada th\u00e0nh h\u00ecnh \u1ea3nh c\u00f3 th\u1ec3 th\u1ea5y \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n
T\u1eeb \u201csonar\u201d (\u0111\u1ecbnh v\u1ecb \u00e2m thanh) g\u1ed3m nh\u1eefng t\u1eeb nh\u01b0 \u201cSound Navigation Ranging\u201d. Sonar r\u1ea5t gi\u1ed1ng v\u1edbi rada. Sonar c\u00f3 th\u1ec3 d\u00f2 t\u00ecm v\u00e0 \u0111\u1ecbnh v\u1ecb c\u00e1c v\u1eadt d\u01b0\u1edbi bi\u1ec3n b\u1eb1ng ti\u1ebfng d\u1ed9i. V\u00ec t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn kh\u00f4ng th\u1ec3 \u0111i s\u00e2u xu\u1ed1ng n\u01b0\u1edbc, thay v\u00e0o \u0111\u1ea5y c\u00e1c b\u1ed9 ph\u1eadn sonar s\u1ebd s\u1eed d\u1ee5ng t\u00edn hi\u1ec7u \u00e2m thanh.<\/p>\n\n\n\n
N\u1ebfu so s\u00e1nh v\u1edbi \u00e2m thanh b\u00ecnh th\u01b0\u1eddng, t\u00edn hi\u1ec7u sonar c\u1ef1c m\u1ea1nh. H\u1ea7u h\u1ebft c\u00e1c b\u1ed9 ph\u1eadn sonar ph\u00e1t \u0111i nh\u1eefng \u00e2m thanh m\u1ea1nh g\u1ea5p tri\u1ec7u l\u1ea7n m\u1ed9t ti\u1ebfng qu\u00e1t. Nh\u1eefng t\u00edn hi\u1ec7u \u00e2m thanh g\u1eedi \u0111i theo t\u1eebng nh\u1ecbp. M\u1ed7i nh\u1ecbp k\u00e9o d\u00e0i kh\u00f4ng qu\u00e1 m\u1ed9t gi\u00e2y.<\/p>\n\n\n\n
Ta c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c \u00e2m thanh c\u1ee7a m\u1ed9t s\u1ed1 m\u00e1y sonar. C\u00f3 nh\u1eefng t\u00edn hi\u1ec7u sonar kh\u00e1c gi\u1ed1ng nh\u01b0 \u00e2m thanh ch\u00f3 tru. Nh\u1eefng \u00e2m thanh c\u00f3 t\u1ea7n s\u1ed1 cao qu\u00e1, l\u1ed7 tai ng\u01b0\u1eddi th\u01b0\u1eddng kh\u00f4ng nghe \u0111\u01b0\u1ee3c. Nh\u01b0ng trong m\u00e1y sonar c\u00f3 b\u1ed9 ph\u1eadn \u0111\u1eb7c bi\u1ec7t nh\u1eadn nh\u1eefng ti\u1ebfng d\u1ed9i v\u1ecdng v\u1ec1. Sau \u0111\u1ea5y, ti\u1ebfng d\u1ed9i \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb c\u00e1c v\u1eadt \u1edf d\u01b0\u1edbi n\u01b0\u1edbc.<\/p>\n\n\n\n
Sonar c\u00f2n \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 d\u00f2 t\u00ecm d\u1ea7u tr\u00ean \u0111\u1ea5t li\u1ec1n. M\u1ed9t nh\u1ecbp sonar \u0111\u01b0\u1ee3c g\u1edfi v\u00e0o l\u00f2ng \u0111\u1ea5t, ti\u1ebfng d\u1ed9i tr\u1edf v\u1ec1 t\u1eeb nhi\u1ec1u t\u1ea7ng \u0111\u00e1, \u0111\u1ea5t b\u00ean d\u01b0\u1edbi s\u1ebd gi\u00fap cho c\u00e1c nh\u00e0 \u0111\u1ecba l\u00fd d\u1ef1 \u0111o\u00e1n c\u00e1i g\u00ec \u0111ang n\u1eb1m s\u00e2u d\u01b0\u1edbi \u0111\u1ea5t.<\/p>\n","protected":false},"excerpt":{"rendered":"
T\u1eeb kh\u00f3a t\u00ecm ki\u1ebfm: H\u00e3y Tr\u1ea3 L\u1eddi Em T\u1ea1i Sao? \u2013 T\u1eadp 9 – Arkady Leokum Ch\u00fang ta h\u00e3y b\u1eaft \u0111\u1ea7u b\u1eb1ng ti\u1ebfng d\u1ed9i. Khi m\u1ed9t \u00e2m thanh b\u1ecb d\u1ed9i ng\u01b0\u1ee3c tr\u1edf l\u1ea1i do g\u1eb7p v\u1eadt c\u1ea3n qu\u00e1 l\u1edbn, ta g\u1ecdi \u00e2m thanh tr\u1edf v\u1ec1 \u0111\u00f3 l\u00e0 ti\u1ebfng d\u1ed9i. Khi m\u1ed9t t\u00edn hi\u1ec7u v\u00f4 tuy\u1ebfn […]<\/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],"tags":[],"class_list":["post-15525","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/15525","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=15525"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/15525\/revisions"}],"predecessor-version":[{"id":15526,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/15525\/revisions\/15526"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=15525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=15525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=15525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}