B\u1ea1n \u0111\u00e3 th\u1ec3 nghi\u1ec7m \u0111i\u1ec1u n\u00e0y ch\u01b0a? Khi k\u1ec1 tai g\u1ea7n mi\u1ec7ng c\u1ee7a c\u00e1c \u0111\u1ed3 \u0111\u1ef1ng tr\u1ed1ng r\u1ed7ng nh\u01b0 ph\u00edch n\u01b0\u1edbc, chai ho\u1eb7c c\u1ed1c v.v. s\u1ebd nghe th\u1ea5y ti\u1ebfng o o. V\u00ec duy\u00ean c\u1edb g\u00ec v\u1eady? C\u00e1c \u0111\u1ed3 \u0111\u1ef1ng kh\u00f4ng ch\u1ee9a g\u00ec \u0111\u00f3 kh\u00f4ng h\u1ec1 c\u00f3 ngu\u1ed3n ph\u00e1t \u00e2m thanh n\u00e0o c\u1ea3 c\u01a1 m\u00e0!<\/p>\n\n\n\n
Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y trong \u00e2m h\u1ecdc g\u1ecdi l\u00e0 c\u1ed9ng h\u01b0\u1edfng \u00e2m thanh. \u0110\u00f3 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ed9ng h\u01b0\u1edfng do s\u1ef1 rung \u0111\u1ed9ng ngu\u1ed3n ph\u00e1t \u00e2m thanh g\u00e2y n\u00ean. V\u00ed d\u1ee5 nh\u01b0, hai v\u1eadt th\u1ec3 ph\u00e1t \u00e2m c\u00f3 t\u1ea7n s\u1ed1 gi\u1ed1ng nhau, n\u1ebfu v\u1eadt n\u00e0y c\u00e1ch v\u1eadt kia kh\u00f4ng xa, r\u1ed3i ch\u1ec9 \u0111\u1ec3 cho m\u1ed9t trong hai v\u1eadt \u0111\u00f3 ph\u00e1t \u00e2m, v\u1eadt kia c\u0169ng c\u00f3 th\u1ec3 theo \u0111\u00f3 m\u00e0 ph\u00e1t ra \u00e2m thanh. \u0110\u00f3 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng c\u1ed9ng h\u01b0\u1edfng.<\/p>\n\n\n\n
Ch\u00fang ta c\u00f3 th\u1ec3 coi kh\u00f4ng kh\u00ed trong nh\u1eefng \u0111\u1ed3 \u0111\u1ef1ng tr\u1ed1ng r\u1ed7ng \u0111\u00f3 nh\u01b0 c\u1ed9t kh\u00f4ng kh\u00ed. C\u1ed9t kh\u00f4ng kh\u00ed c\u0169ng l\u00e0 m\u1ed9t v\u1eadt th\u1ec3 ph\u00e1t \u00e2m. Khi xung quanh \u0111\u1ed3 \u0111\u1ef1ng tr\u1ed1ng r\u1ed7ng c\u00f3 m\u1ed9t \u00e2m thanh v\u1edbi t\u1ea7n s\u1ed1 th\u00edch h\u1ee3p, c\u1ed9t kh\u00f4ng kh\u00ed s\u1ebd sinh ra c\u1ed9ng h\u01b0\u1edfng \u00e2m thanh, v\u00e0 l\u00e0m cho \u00e2m thanh \u0111\u00f3 t\u0103ng m\u1ea1nh l\u00ean. C\u00e1c nh\u00e0 v\u1eadt l\u00ed sau khi \u0111i s\u00e2u nghi\u00ean c\u1ee9u \u0111\u00e3 ph\u00e1t hi\u1ec7n: ch\u1ec9 c\u1ea7n m\u1ed9t \u00e2m thanh c\u00f3 b\u01b0\u1edbc s\u00f3ng b\u1eb1ng 4 l\u1ea7n, ho\u1eb7c 3\/4, 5\/4\u2026 \u0111\u1ed9 d\u00e0i c\u1ee7a c\u1ed9t kh\u00f4ng kh\u00ed truy\u1ec1n v\u00e0o \u0111\u1ed3 \u0111\u1ef1ng, c\u00f3 th\u1ec3 g\u00e2y ra c\u1ed9ng h\u01b0\u1edfng \u00e2m thanh. Chi\u1ec1u cao b\u00ean trong c\u1ee7a ph\u00edch n\u01b0\u1edbc n\u00f3ng th\u00f4ng th\u01b0\u1eddng v\u00e0o kho\u1ea3ng 30 cm. C\u00f3 th\u1ec3 t\u00ednh ra, n\u1ebfu c\u00f3 \u00e2m thanh v\u1edbi b\u01b0\u1edbc s\u00f3ng 120 cm, ho\u1eb7c 40 cm, 24 cm\u2026 truy\u1ec1n v\u00e0o trong ph\u00edch th\u00ec \u0111\u1ec1u c\u00f3 kh\u1ea3 n\u0103ng g\u00e2y ra c\u1ed9ng h\u01b0\u1edfng \u00e2m thanh.<\/p>\n\n\n\n
Xung quanh ch\u00fang ta l\u00e0 m\u1ed9t th\u1ebf gi\u1edbi \u00e2m thanh, kh\u00f4ng gi\u00e2y ph\u00fat n\u00e0o thi\u1ebfu v\u1eafng \u00e2m thanh \u0111\u1ee7 m\u1ecdi b\u01b0\u1edbc s\u00f3ng: ti\u1ebfng c\u1ee7a ng\u01b0\u1eddi v\u00e0 \u0111\u1ed9ng v\u1eadt, ti\u1ebfng gi\u00f3 v\u00e0 n\u01b0\u1edbc ch\u1ea3y, ti\u1ebfng m\u00e1y v\u00e0 xe c\u1ed9\u2026 Ngay c\u1ea3 trong \u0111\u00eam khuya thanh v\u1eafng c\u0169ng c\u00f3 \u00e2m thanh c\u00e1c lo\u1ea1i t\u1eeb xa v\u1eb3ng l\u1ea1i, ch\u1ec9 c\u00f3 \u0111i\u1ec1u ch\u00fang t\u01b0\u01a1ng \u0111\u1ed1i y\u1ebfu, ch\u00fang ta kh\u00f4ng d\u1ec5 nghe th\u1ea5y m\u00e0 th\u00f4i. Trong s\u1ed1 nhi\u1ec1u \u00e2m thanh \u0111\u00f3, c\u00f3 lo\u1ea1i c\u00f3 th\u1ec3 k\u00edch th\u00edch cho c\u00e1c th\u1ee9 \u0111\u1ed3 \u0111\u1ef1ng c\u1ed9ng h\u01b0\u1edfng. \u00c2m thanh y\u1ebfu sau khi \u0111\u00e3 g\u00e2y cho c\u1ed9t kh\u00f4ng kh\u00ed trong \u0111\u1ed3 \u0111\u1ef1ng c\u1ed9ng h\u01b0\u1edfng s\u1ebd \u0111\u01b0\u1ee3c t\u0103ng m\u1ea1nh l\u00ean. N\u00f3i chung th\u00ec bao gi\u1edd c\u0169ng c\u00f3 \u00e2m thanh nhi\u1ec1u lo\u1ea1i b\u01b0\u1edbc s\u00f3ng \u0111\u1ed3ng th\u1eddi sinh ra c\u1ed9ng h\u01b0\u1edfng trong \u0111\u00f3. \u0110\u00f3 ch\u00ednh l\u00e0 ti\u1ebfng o o m\u00e0 ch\u00fang ta nghe \u0111\u01b0\u1ee3c khi k\u1ec1 tai v\u00e0o g\u1ea7n mi\u1ec7ng c\u00e1c \u0111\u1ed3 \u0111\u1ef1ng tr\u1ed1ng r\u1ed7ng nh\u01b0 ph\u00edch n\u01b0\u1edbc v.v. C\u1ed9t kh\u00f4ng kh\u00ed m\u00e0 ng\u1eafn th\u00ec b\u01b0\u1edbc s\u00f3ng c\u1ee7a \u00e2m thanh g\u00e2y ra c\u1ed9ng h\u01b0\u1edfng c\u0169ng ng\u1eafn. V\u00ec v\u1eady, ti\u1ebfng o o ph\u00e1t ra t\u1eeb m\u1ed9t c\u00e1i chai nh\u1ecf s\u1ebd l\u1ea3nh l\u00f3i h\u01a1n.<\/p>\n\n\n\n
N\u1ebfu \u0111\u1ed3 \u0111\u1ef1ng c\u00f3 ch\u1ed7 b\u1ecb n\u1ee9t h\u1ecfng, l\u00e0m cho t\u00ednh ho\u00e0n ch\u1ec9nh v\u1ed1n c\u00f3 c\u1ee7a c\u1ed9t kh\u00f4ng kh\u00ed b\u1ecb t\u1ed5n h\u1ea1i, th\u00ec \u00e2m thanh c\u1ed9ng h\u01b0\u1edfng c\u0169ng s\u1ebd b\u1ecb thay \u0111\u1ed5i. V\u00ec v\u1eady, ng\u01b0\u1eddi ta th\u01b0\u1eddng th\u00f4ng qua vi\u1ec7c nghe ti\u1ebfng o o c\u1ee7a c\u00e1i ph\u00edch r\u1ed7ng \u0111\u1ec3 ki\u1ec3m tra xem ru\u1ed9t ph\u00edch c\u00f3 b\u1ecb n\u1ee9t h\u1ecfng hay kh\u00f4ng.<\/p>\n\n\n\n
T\u1eeb kh\u00f3a: C\u1ed9ng h\u01b0\u1edfng; C\u1ed9ng h\u01b0\u1edfng \u00e2m thanh; C\u1ed9t kh\u00f4ng kh\u00ed.<\/p>\n\n\n\n
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B\u1ea1n \u0111\u00e3 th\u1ec3 nghi\u1ec7m \u0111i\u1ec1u n\u00e0y ch\u01b0a? Khi k\u1ec1 tai g\u1ea7n mi\u1ec7ng c\u1ee7a c\u00e1c \u0111\u1ed3 \u0111\u1ef1ng tr\u1ed1ng r\u1ed7ng nh\u01b0 ph\u00edch n\u01b0\u1edbc, chai ho\u1eb7c c\u1ed1c v.v. s\u1ebd nghe th\u1ea5y ti\u1ebfng o o. V\u00ec duy\u00ean c\u1edb g\u00ec v\u1eady? C\u00e1c \u0111\u1ed3 \u0111\u1ef1ng kh\u00f4ng ch\u1ee9a g\u00ec \u0111\u00f3 kh\u00f4ng h\u1ec1 c\u00f3 ngu\u1ed3n ph\u00e1t \u00e2m thanh n\u00e0o c\u1ea3 c\u01a1 m\u00e0! Hi\u1ec7n […]<\/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-5608","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\/5608","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=5608"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5608\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5608"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5608"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5608"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}