M\u1ed9t chi\u1ebfc t\u00e0u th\u00e1m hi\u1ec3m \u0111ang ch\u1ea1y tr\u00ean bi\u1ec3n, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u1ec1u \u0111ang kh\u1ea9n tr\u01b0\u01a1ng l\u00e0m vi\u1ec7c. Ng\u01b0\u1eddi \u0111ang \u0111o \u0111\u1ed9 s\u00e2u c\u1ee7a n\u01b0\u1edbc, ng\u01b0\u1eddi th\u00ec \u0111o nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc\u2026 M\u1ed9t nh\u00e0 kh\u00ed t\u01b0\u1ee3ng \u0111\u01b0a qu\u1ea3 b\u00f3ng ch\u1ee9a hi\u0111ro g\u1ea7n v\u00e0o tai nghe th\u1eed xem, l\u1eadp t\u1ee9c \u00f4ng ta kh\u1ea9n c\u1ea5p b\u00e1o cho to\u00e0n \u0111\u1ed9i th\u00e1m hi\u1ec3m: “gi\u00f3 b\u00e3o tr\u00ean bi\u1ec3n s\u1eafp \u0111\u1ebfn”. Ngay trong \u0111\u00eam \u1ea5y, tr\u00ean bi\u1ec3n \u0111\u00e3 x\u1ea3y ra gi\u00f3 b\u00e3o d\u1eef d\u1ed9i.<\/p>\n\n\n\n
M\u1ed9t qu\u1ea3 b\u00f3ng ch\u1ee9a hi\u0111ro l\u00e0m sao c\u00f3 th\u1ec3 d\u1ef1 b\u00e1o gi\u00f3 b\u00e3o tr\u00ean bi\u1ec3n? Ch\u1eb3ng nh\u1ebd n\u00f3 c\u00f3 ph\u00e9p l\u1ea1 \u01b0?<\/p>\n\n\n\n
Th\u00ec ra, khi gi\u00f3 b\u00e3o x\u1ea3y ra tr\u00ean m\u1eb7t bi\u1ec3n xa, xo\u00e1y kh\u00f4ng kh\u00ed do gi\u00f3 m\u1ea1nh tr\u00ean cao sinh ra s\u1ebd l\u00e0m cho kh\u00f4ng kh\u00ed dao \u0111\u1ed9ng m\u00e3nh li\u1ec7t. Lo\u1ea1i dao \u0111\u1ed9ng n\u00e0y c\u00f3 t\u1ea7n s\u1ed1 kh\u00f4ng \u0111\u1ebfn 20 Hz, tai ng\u01b0\u1eddi kh\u00f4ng nghe th\u1ea5y. Lo\u1ea1i s\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 th\u1ea5p h\u01a1n 20 Hz g\u1ecdi l\u00e0 s\u00f3ng h\u1ea1 \u00e2m (hay h\u1ea1 \u00e2m). S\u00f3ng h\u1ea1 \u00e2m c\u0169ng truy\u1ec1n \u0111i v\u1edbi t\u1ed1c \u0111\u1ed9 \u00e2m thanh, c\u00f3 th\u1ec3 truy\u1ec1n r\u1ea5t xa. V\u00ec v\u1eady, t\u1ed1c \u0111\u1ed9 truy\u1ec1n c\u1ee7a s\u00f3ng h\u1ea1 \u00e2m nhanh h\u01a1n nhi\u1ec1u so v\u1edbi gi\u00f3 b\u00e3o. C\u00f2n qu\u1ea3 b\u00f3ng b\u01a1m \u0111\u1ea7y hi\u0111ro l\u1ea1i c\u00f3 th\u1ec3 x\u1ea3y ra c\u1ed9ng h\u01b0\u1edfng v\u1edbi s\u00f3ng h\u1ea1 \u00e2m, sinh ra m\u1ed9t lo\u1ea1i dao \u0111\u1ed9ng. C\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a lo\u1ea1i dao \u0111\u1ed9ng n\u00e0y c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t lo\u1ea1i s\u1ee9c \u00e9p \u0111\u1ed1i v\u1edbi m\u00e0ng nh\u0129 c\u1ee7a ng\u01b0\u1eddi \u0111\u1ee9ng g\u1ea7n qu\u1ea3 b\u00f3ng ch\u1ee9a hi\u0111ro, l\u00e0m cho m\u00e0ng nh\u0129 c\u1ea3m th\u1ea5y \u0111au nh\u1ee9c. Gi\u00f3 b\u00e3o tr\u00ean bi\u1ec3n c\u00e0ng t\u1edbi g\u1ea7n, c\u1ea3m gi\u00e1c n\u00e0y c\u00e0ng r\u00f5 r\u1ec7t. C\u00e1c nh\u00e0 kh\u00ed t\u01b0\u1ee3ng c\u0103n c\u1ee9 v\u00e0o lo\u1ea1i c\u1ea3m gi\u00e1c \u0111\u00f3 m\u00e0 ph\u00e1n \u0111o\u00e1n \u0111\u01b0\u1ee3c gi\u00f3 b\u00e3o s\u1eafp s\u1eeda \u0111\u1ebfn.<\/p>\n\n\n\n
Hi\u1ec7n nay, ng\u01b0\u1eddi ta \u0111\u00e3 l\u1ee3i d\u1ee5ng nguy\u00ean l\u00ed \u0111\u00f3 \u0111\u1ec3 ch\u1ebf t\u1ea1o ra m\u00e1y d\u1ef1 b\u00e1o gi\u00f3 b\u00e3o tr\u00ean bi\u1ec3n t\u1ef1 \u0111\u1ed9ng ghi l\u1ea1i \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n
M\u1ed9t s\u1ed1 \u0111\u1ed9ng v\u1eadt bi\u1ec3n c\u0169ng r\u1ea5t nh\u1ea1y c\u1ea3m v\u1edbi s\u00f3ng h\u1ea1 \u00e2m. M\u1ed7i khi tr\u00f4ng th\u1ea5y t\u00f4m con g\u1ea7n b\u1edd nh\u1ea3y v\u1ecdt ra xa b\u1edd, c\u00e1 v\u00e0 s\u1ee9a v\u1ed9i v\u00e3 r\u1eddi m\u1eb7t n\u01b0\u1edbc, l\u1eb7n s\u00e2u xu\u1ed1ng \u0111\u00e1y bi\u1ec3n, th\u00ec nh\u1eefng ng\u01b0 d\u00e2n c\u00f3 kinh nghi\u1ec7m li\u1ec1n bi\u1ebft l\u00e0 gi\u00f3 b\u00e3o tr\u00ean bi\u1ec3n s\u1eafp k\u00e9o t\u1edbi. H\u1ecd nhanh ch\u00f3ng thu l\u01b0\u1edbi v\u00e0 tr\u1edf v\u1ec1 b\u1ebfn.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: Gi\u00f3 b\u00e3o tr\u00ean bi\u1ec3n; S\u00f3ng h\u1ea1 \u00e2m.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
M\u1ed9t chi\u1ebfc t\u00e0u th\u00e1m hi\u1ec3m \u0111ang ch\u1ea1y tr\u00ean bi\u1ec3n, c\u00e1c nh\u00e0 khoa h\u1ecdc \u0111\u1ec1u \u0111ang kh\u1ea9n tr\u01b0\u01a1ng l\u00e0m vi\u1ec7c. Ng\u01b0\u1eddi \u0111ang \u0111o \u0111\u1ed9 s\u00e2u c\u1ee7a n\u01b0\u1edbc, ng\u01b0\u1eddi th\u00ec \u0111o nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc\u2026 M\u1ed9t nh\u00e0 kh\u00ed t\u01b0\u1ee3ng \u0111\u01b0a qu\u1ea3 b\u00f3ng ch\u1ee9a hi\u0111ro g\u1ea7n v\u00e0o tai nghe th\u1eed xem, l\u1eadp t\u1ee9c \u00f4ng ta kh\u1ea9n c\u1ea5p b\u00e1o cho […]<\/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-5628","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\/5628","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=5628"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5628\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}