B\u1ea1n c\u00f3 bi\u1ebft c\u1ea3m gi\u00e1c kh\u00f3 ch\u1ecbu, nh\u00f3i l\u00ean trong tai khi l\u00e1i xe v\u1edbi c\u1eeda s\u1ed5 sau m\u1edf h\u00e9 kh\u00f4ng? \u0110\u00f3 l\u00e0 m\u1ed9t c\u1ea3m gi\u00e1c ph\u1ed5 bi\u1ebfn v\u00e0 kh\u00f3 ch\u1ecbu do m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng v\u1eadt l\u00fd th\u00fa v\u1ecb \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ed9ng h\u01b0\u1edfng Helmholtz g\u00e2y ra. V\u1ec1 c\u01a1 b\u1ea3n, xe c\u1ee7a b\u1ea1n bi\u1ebfn th\u00e0nh m\u1ed9t \u201cnh\u1ea1c c\u1ee5 kh\u1ed5ng l\u1ed3.\u201d N\u00f3 rung \u0111\u1ed9ng, t\u1ea1o ra nh\u1eefng s\u00f3ng \u00e1p su\u1ea5t \u0111\u1ee7 m\u1ea1nh \u0111\u1ec3 g\u00e2y \u0111au \u0111\u1edbn cho tai.<\/p>\n
\u0110\u1ec3 hi\u1ec3u r\u00f5 t\u1ea1i sao, h\u00e3y ngh\u0129 \u0111\u1ebfn \u0111i\u1ec1u g\u00ec x\u1ea3y ra khi b\u1ea1n th\u1ed5i v\u00e0o mi\u1ec7ng m\u1ed9t chai r\u1ed7ng. Lu\u1ed3ng kh\u00f4ng kh\u00ed \u00f9a v\u00e0o t\u1ea1o ra m\u1ed9t chu k\u1ef3: n\u00f3 b\u1ecb h\u00fat v\u00e0o chai, n\u00e9n kh\u00f4ng kh\u00ed b\u00ean trong, r\u1ed3i l\u1ea1i b\u1ecb \u0111\u1ea9y ra ngo\u00e0i. Chuy\u1ec3n \u0111\u1ed9ng rung \u0111\u1ed9ng nhanh ch\u00f3ng c\u1ee7a kh\u00f4ng kh\u00ed n\u00e0y t\u1ea1o ra m\u1ed9t \u00e2m thanh c\u1ee5 th\u1ec3. Xe c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng theo nguy\u00ean l\u00fd t\u01b0\u01a1ng t\u1ef1 khi ch\u1ec9 m\u1edf m\u1ed9t c\u1eeda s\u1ed5 sau.<\/p>\n
Khi b\u1ea1n l\u00e1i xe, lu\u1ed3ng kh\u00f4ng kh\u00ed chuy\u1ec3n \u0111\u1ed9ng nhanh b\u00ean ngo\u00e0i xe s\u1ebd \u00f9a qua khe h\u1edf nh\u1ecf c\u1ee7a c\u1eeda s\u1ed5. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t lu\u1ed3ng xo\u00e1y h\u00fat kh\u00f4ng kh\u00ed v\u00e0o cabin xe. Lu\u1ed3ng kh\u00f4ng kh\u00ed \u0111\u1ed9t ng\u1ed9t n\u00e0y l\u00e0m t\u0103ng \u00e1p su\u1ea5t b\u00ean trong, v\u00e0 khi \u00e1p su\u1ea5t qu\u00e1 cao, kh\u00f4ng kh\u00ed s\u1ebd \u00f9a ra ngo\u00e0i. Chu k\u1ef3 kh\u00f4ng kh\u00ed b\u1ecb h\u00fat v\u00e0o v\u00e0 \u0111\u1ea9y ra n\u00e0y l\u1eb7p l\u1ea1i c\u1ef1c k\u1ef3 nhanh ch\u00f3ng, t\u1ea1o ra nh\u1eefng s\u00f3ng \u00e1p su\u1ea5t m\u1ea1nh m\u1ebd.<\/p>\n
Trong khi \u00e2m thanh ph\u00e1t ra t\u1eeb chai l\u00e0 ti\u1ebfng hu\u00fdt s\u00e1o the th\u00e9, th\u00ec t\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng \u00e1p su\u1ea5t b\u00ean trong xe l\u1ea1i th\u1ea5p h\u01a1n nhi\u1ec1u \u2013 \u0111\u1ebfn m\u1ee9c n\u00f3 r\u01a1i v\u00e0o d\u1ea3i h\u1ea1 \u00e2m, th\u1ea5p h\u01a1n m\u1ee9c tai ng\u01b0\u1eddi c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c m\u1ed9t c\u00e1ch c\u00f3 \u00fd th\u1ee9c. M\u1eb7c d\u00f9 b\u1ea1n kh\u00f4ng th\u1ec3 nghe \u00e2m thanh \u0111\u00f3, nh\u01b0ng tai v\u00e0 c\u01a1 th\u1ec3 ch\u1eafc ch\u1eafn s\u1ebd c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c nh\u1eefng dao \u0111\u1ed9ng \u00e1p su\u1ea5t d\u1eef d\u1ed9i. \u0110\u00e2y kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t rung \u0111\u1ed9ng nh\u1ecf; c\u00e1c \u0111\u1ec9nh \u00e1p su\u1ea5t c\u00f3 th\u1ec3 c\u1ef1c k\u1ef3 m\u1ea1nh, \u0111\u1ea1t t\u1edbi m\u1ee9c 130 decibel. \u0110\u1ec3 d\u1ec5 h\u00ecnh dung, \u00e2m thanh n\u00e0y l\u1edbn h\u01a1n c\u1ea3 ti\u1ebfng m\u00e1y\u00a0khoan, m\u1ed9t bu\u1ed5i h\u00f2a nh\u1ea1c rock hay\u00a0ti\u1ebfng \u0111\u1ed9ng c\u01a1 ph\u1ea3n l\u1ef1c t\u1eeb kho\u1ea3ng c\u00e1ch 30 m\u00e9t. M\u00e0ng nh\u0129, v\u1ed1n r\u1ea5t nh\u1ea1y c\u1ea3m v\u1edbi nh\u1eefng thay \u0111\u1ed5i v\u1ec1 \u00e1p su\u1ea5t, s\u1ebd ph\u1ea3n \u1ee9ng v\u1edbi l\u01b0\u1ee3ng \u00e2m thanh m\u1ea1nh m\u1ebd n\u00e0y, g\u00e2y ra c\u1ea3m gi\u00e1c \u0111au nh\u00f3i trong tai.<\/p>\n
T\u1ea1i sao thi\u1ebft\u00a0k\u1ebf xe l\u1ea1i quan\u00a0tr\u1ecdng?<\/p>\n
Thi\u1ebft k\u1ebf c\u1ee7a nh\u1eefng chi\u1ebfc xe hi\u1ec7n \u0111\u1ea1i c\u00e0ng l\u00e0m cho hi\u1ec7u \u1ee9ng n\u00e0y r\u00f5 r\u1ec7t h\u01a1n. C\u00e1c xe m\u1edbi \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf theo h\u01b0\u1edbng kh\u00ed \u0111\u1ed9ng h\u1ecdc v\u00e0 k\u00edn kh\u00ed \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t nhi\u00ean li\u1ec7u v\u00e0 t\u1ea1o ra nh\u1eefng chuy\u1ebfn \u0111i \u00eam \u00e1i. M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y r\u1ea5t t\u1ed1t cho vi\u1ec7c di chuy\u1ec3n, nh\u01b0ng n\u00f3 c\u0169ng \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c kh\u00f4ng gian tho\u00e1t kh\u00ed s\u1ebd b\u1ecb h\u1eb9p. Khi b\u1ea1n ch\u1ec9 m\u1edf m\u1ed9t c\u1eeda s\u1ed5 sau, b\u1ea1n \u0111ang t\u1ea1o ra m\u1ed9t l\u1ed7 th\u00f4ng h\u01a1i nh\u1ecf trong m\u1ed9t h\u1ed9p k\u00edn. \u0110i\u1ec1u n\u00e0y l\u00e0m t\u0103ng \u00e1p su\u1ea5t t\u00edch t\u1ee5 v\u00e0 c\u1ed9ng h\u01b0\u1edfng Helmholtz. Nh\u1eefng chi\u1ebfc xe c\u0169, h\u00ecnh h\u1ed9p th\u01b0\u1eddng d\u1ec5 b\u1ecb r\u00f2 r\u1ec9, cho ph\u00e9p m\u1ed9t ph\u1ea7n \u00e1p su\u1ea5t tho\u00e1t ra ngo\u00e0i v\u00e0 gi\u00fap ph\u00e1 v\u1ee1 hi\u1ec7u \u1ee9ng c\u1ed9ng h\u01b0\u1edfng.<\/p>\n
C\u00e1ch ng\u0103n ng\u1eeba rung \u0111\u1ed9ng<\/p>\n
May m\u1eafn thay, c\u00f3 m\u1ed9t s\u1ed1 c\u00e1ch d\u1ec5 d\u00e0ng \u0111\u1ec3 tr\u00e1nh tr\u1ea3i nghi\u1ec7m kh\u00f3 ch\u1ecbu n\u00e0y:\u00a0ph\u00e1 v\u1ee1 chu k\u1ef3 c\u1ed9ng h\u01b0\u1edfng v\u00e0 cho ph\u00e9p lu\u1ed3ng kh\u00f4ng kh\u00ed \u0111\u01b0\u1ee3c c\u00e2n b\u1eb1ng.<\/p>\n
M\u1edf th\u00eam m\u1ed9t c\u1eeda s\u1ed5: Gi\u1ea3i ph\u00e1p \u0111\u01a1n gi\u1ea3n nh\u1ea5t l\u00e0 m\u1edf th\u00eam m\u1ed9t c\u1eeda s\u1ed5 n\u1eefa, \u0111\u1eb7c bi\u1ec7t c\u1eeda s\u1ed5 ch\u00e9o so v\u1edbi c\u00e1i \u0111\u1ea7u ti\u00ean. Vi\u1ec7c n\u00e0y t\u1ea1o ra m\u1ed9t l\u1ed1i tho\u00e1t cho kh\u00f4ng kh\u00ed n\u00e9n, ng\u0103n kh\u00f4ng cho n\u00f3 t\u00edch t\u1ee5 v\u00e0 g\u00e2y ra rung \u0111\u1ed9ng m\u1ea1nh.<\/p>\n
M\u1edf c\u1eeda s\u1ed5 tr\u01b0\u1edbc: Vi\u1ec7c m\u1edf c\u1eeda s\u1ed5 tr\u01b0\u1edbc thay v\u00ec c\u00e1i \u1edf \u0111\u1eb1ng sau th\u01b0\u1eddng kh\u00f4ng g\u00e2y ra v\u1ea5n \u0111\u1ec1 t\u01b0\u01a1ng t\u1ef1. Lu\u1ed3ng kh\u00ed xung quanh \u0111\u1ea7u xe h\u1ed7n lo\u1ea1n h\u01a1n nhi\u1ec1u v\u00e0 \u00edt c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o ra lo\u1ea1i c\u1ed9ng h\u01b0\u1edfng \u1ed5n \u0111\u1ecbnh c\u1ea7n thi\u1ebft cho hi\u1ec7u \u1ee9ng n\u00e0y.<\/p>\n
S\u1eed d\u1ee5ng \u0111i\u1ec1u h\u00f2a: N\u1ebfu b\u1ea1n mu\u1ed1n \u0111\u00f3ng t\u1ea5t c\u1ea3 c\u1eeda s\u1ed5 \u0111\u1ec3 tr\u00e1nh ti\u1ebfng \u1ed3n ho\u1eb7c kh\u00f3 ch\u1ecbu, ch\u1ec9 c\u1ea7n b\u1eadt \u0111i\u1ec1u h\u00f2a. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 d\u1ec5 ch\u1ecbu m\u00e0 kh\u00f4ng ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi s\u00f3ng \u00e1p su\u1ea5t ch\u00f3i tai.<\/p>\n
B\u1eb1ng c\u00e1ch hi\u1ec3u \u0111\u01b0\u1ee3c nguy\u00ean l\u00fd v\u1eadt l\u00fd \u0111\u1eb1ng sau c\u1ed9ng h\u01b0\u1edfng Helmholtz, b\u1ea1n s\u1ebd\u00a0d\u1ec5 d\u00e0ng ng\u0103n ng\u1eeba c\u1ea3m gi\u00e1c ch\u00f3i tai \u0111\u00f3 v\u00e0 b\u1ea3o \u0111\u1ea3m m\u00ecnh s\u1ebd m\u1ed9t chuy\u1ebfn \u0111i tho\u1ea3i m\u00e1i v\u00e0 y\u00ean t\u0129nh.<\/p>\n
H\u01a1n n\u1eefa, vi\u1ec7c \u0111\u1ec3 c\u1eeda s\u1ed5 xe h\u01a1i m\u1edf, d\u00f9 ch\u1ec9 m\u1ed9t ch\u00fat th\u00f4i, c\u0169ng d\u1eabn \u0111\u1ebfn nhi\u1ec1u v\u1ea5n \u0111\u1ec1, t\u1eeb nh\u1eefng b\u1ea5t ti\u1ec7n nh\u1ecf \u0111\u1ebfn nh\u1eefng h\u01b0 h\u1ecfng \u0111\u00e1ng k\u1ec3 v\u00e0 r\u1ee7i ro an to\u00e0n.<\/p>\n
D\u1ec5 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi th\u1eddi ti\u1ebft: \u0110\u00e2y l\u00e0 r\u1ee7i ro r\u00f5 r\u00e0ng nh\u1ea5t. M\u1ed9t c\u01a1n m\u01b0a r\u00e0o b\u1ea5t ng\u1edd nhanh ch\u00f3ng l\u00e0m \u01b0\u1edbt n\u1ed9i th\u1ea5t xe, d\u1eabn \u0111\u1ebfn h\u01b0 h\u1ecfng n\u01b0\u1edbc tr\u00ean v\u1ea3i b\u1ecdc, th\u1ea3m v\u00e0 c\u00e1c linh ki\u1ec7n \u0111i\u1ec7n t\u1eed nh\u01b0 d\u00e0n \u00e2m thanh n\u1ed5i ho\u1eb7c h\u1ec7 th\u1ed1ng \u0111\u1ecbnh v\u1ecb. \u0110i\u1ec1u n\u00e0y c\u0169ng g\u00e2y ra s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a n\u1ea5m m\u1ed1c, g\u00e2y ra m\u00f9i m\u1ed1c kh\u00f3 kh\u1eed. \u1ede nh\u1eefng v\u00f9ng kh\u00ed h\u1eadu l\u1ea1nh, tuy\u1ebft v\u00e0 b\u0103ng s\u1ebd t\u00edch t\u1ee5 b\u00ean trong xe.<\/p>\n
Tr\u1ed9m c\u1eafp v\u00e0 ph\u00e1 ho\u1ea1i: C\u1eeda s\u1ed5 m\u1edf l\u00e0 l\u1eddi m\u1eddi g\u1ecdi cho nh\u1eefng t\u00ean tr\u1ed9m \u0111ang r\u00ecnh r\u1eadp. Ngay c\u1ea3 khi b\u1ea1n kh\u00f4ng \u0111\u1ec3 \u0111\u1ed3 v\u1eadt c\u00f3 gi\u00e1 tr\u1ecb \u1edf n\u01a1i d\u1ec5 th\u1ea5y, k\u1ebb tr\u1ed9m v\u1eabn d\u1ec5 d\u00e0ng v\u1edbi tay v\u00e0o v\u00e0 m\u1edf kh\u00f3a c\u1eeda ho\u1eb7c \u0111\u00e1nh c\u1eafp b\u1ea5t k\u1ef3 v\u1eadt d\u1ee5ng n\u00e0o cho d\u00f9 \u0111\u01b0\u1ee3c c\u1ea5t gi\u1ea5u kh\u00f4ng k\u1ef9.<\/p>\n
H\u01b0 xe: M\u01b0a v\u00e0 \u0111\u1ed9 \u1ea9m g\u00e2y ra c\u00e1c s\u1ef1 c\u1ed1 v\u1ec1 \u0111i\u1ec7n v\u00e0 r\u1ec9 s\u00e9t. Theo th\u1eddi gian, vi\u1ec7c ti\u1ebfp x\u00fac th\u01b0\u1eddng xuy\u00ean v\u1edbi c\u00e1c y\u1ebfu t\u1ed1 th\u1eddi ti\u1ebft khi\u1ebfn n\u1ed9i th\u1ea5t xe b\u1ecb xu\u1ed1ng c\u1ea5p.<\/p>\n
C\u00f4n tr\u00f9ng v\u00e0 s\u00e2u b\u1ecd: C\u1eeda s\u1ed5 m\u1edf l\u00e0 l\u1ed1i v\u00e0o tr\u1ef1c ti\u1ebfp c\u1ee7a c\u00f4n tr\u00f9ng v\u00e0 c\u00e1c lo\u1ea1i s\u00e2u b\u1ecd nh\u1ecf kh\u00e1c. Khi quay tr\u1edf l\u1ea1i xe, b\u1ea1n s\u1ebd th\u1ea5y n\u00f3 \u0111\u1ea7y mu\u1ed7i, nh\u1ec7n ho\u1eb7c c\u00e1c sinh v\u1eadt kh\u00e1c, v\u1eeba g\u00e2y phi\u1ec1n to\u00e1i v\u1eeba ti\u1ec1m \u1ea9n nguy c\u01a1 g\u00e2y h\u1ea1i cho s\u1ee9c kh\u1ecfe.<\/p>\n
Nguy hi\u1ec3m cho tr\u1ebb v\u00e0 th\u00fa c\u01b0ng: N\u1ebfu xe \u0111\u1eadu m\u00e0 kh\u00f4ng c\u00f3 ng\u01b0\u1eddi tr\u00f4ng coi, vi\u1ec7c h\u1ea1 c\u1eeda s\u1ed5 xu\u1ed1ng g\u00e2y nguy hi\u1ec3m cho tr\u1ebb em, c\u0169ng nh\u01b0 th\u00fa c\u01b0ng, v\u00ec b\u00e9 c\u00f3 th\u1ec3 th\u00f2 tay v\u00e0o ho\u1eb7c ra ngo\u00e0i. M\u1ed9t s\u1ed1 n\u01a1i c\u00f2n c\u00f3 lu\u1eadt c\u1ea5m \u0111\u1ec3 c\u1eeda s\u1ed5 m\u1edf khi xe kh\u00f4ng c\u00f3 ng\u01b0\u1eddi tr\u00f4ng coi, h\u00e0nh vi n\u00e0y c\u00f3 nguy c\u01a1 b\u1ecb ph\u1ea1t.<\/p>\n
(theo Mentalfloss)<\/p>\n
The post L\u00fd do kh\u00f4ng n\u00ean m\u1edf c\u1eeda s\u1ed5 ph\u00eda sau khi l\u00e1i xe<\/a> appeared first on Saigon Nh\u1ecf<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" B\u1ea1n c\u00f3 bi\u1ebft c\u1ea3m gi\u00e1c kh\u00f3 ch\u1ecbu, nh\u00f3i l\u00ean trong tai khi l\u00e1i xe v\u1edbi c\u1eeda s\u1ed5 sau m\u1edf h\u00e9 kh\u00f4ng? \u0110\u00f3 l\u00e0 m\u1ed9t c\u1ea3m gi\u00e1c ph\u1ed5 bi\u1ebfn v\u00e0 kh\u00f3 ch\u1ecbu do m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng v\u1eadt l\u00fd th\u00fa v\u1ecb \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ed9ng h\u01b0\u1edfng Helmholtz g\u00e2y ra. V\u1ec1 c\u01a1 b\u1ea3n, xe c\u1ee7a b\u1ea1n bi\u1ebfn th\u00e0nh …<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[144],"tags":[],"class_list":["post-60050","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"_links":{"self":[{"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/posts\/60050","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/comments?post=60050"}],"version-history":[{"count":0,"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/posts\/60050\/revisions"}],"wp:attachment":[{"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/media?parent=60050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/categories?post=60050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vietvalley.com\/en\/wp-json\/wp\/v2\/tags?post=60050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}