Va\u0300o mu\u0300a \u0111\u00f4ng, khi ba\u0323n c\u01a1\u0309i nh\u01b0\u0303ng b\u00f4\u0323 qu\u00e2\u0300n a\u0301o len la\u0300m t\u01b0\u0300 s\u01a1\u0323i t\u00f4\u0309ng h\u01a1\u0323p ra ba\u0323n th\u01b0\u01a1\u0300ng nghe th\u00e2\u0301y nh\u01b0\u0303ng ti\u00ea\u0301ng n\u00f4\u0309 “la\u0301ch ta\u0301ch” r\u00e2\u0301t nho\u0309. N\u00ea\u0301u ba\u0323n c\u01a1\u0309i qu\u00e2\u0300n a\u0301o len va\u0300o bu\u00f4\u0309i t\u00f4\u0301i hay \u01a1\u0309 ch\u00f4\u0303 t\u00f4\u0301i ba\u0323n co\u0300n nhi\u0300n ro\u0303 nh\u01b0\u0303ng tia l\u01b0\u0309a \u0111i\u00ea\u0323n pha\u0301t ra t\u01b0\u0300 b\u00ea\u0300 m\u0103\u0323t qu\u00e2\u0300n a\u0301o. Ta\u0323i sao?<\/p>\n\n\n\n
B\u01a1\u0309i vi\u0300, s\u01a1\u0323i len la\u0300 m\u00f4\u0323t loa\u0323i s\u01a1\u0323i t\u00f4\u0309ng h\u01a1\u0323p. S\u01a1\u0323i t\u00f4\u0309ng h\u01a1\u0323p la\u0300 m\u00f4\u0323t ch\u00e2\u0301t ca\u0301ch \u0111i\u00ea\u0323n t\u00f4\u0301t, r\u00e2\u0301t i\u0301t hu\u0301t \u00e2\u0309m. Khi m\u0103\u0323c qu\u00e2\u0300n a\u0301o la\u0300m t\u01b0\u0300 loa\u0323i s\u01a1\u0323i na\u0300y, ca\u0301c s\u01a1\u0323i len trong qu\u00e2\u0300n a\u0301o se\u0303 co\u0301 ma sa\u0301t tuy\u0300 theo s\u01b0\u0323 v\u00e2\u0323n \u0111\u00f4\u0323ng cu\u0309a c\u01a1 th\u00ea\u0309. S\u01b0\u0323 ma sa\u0301t na\u0300y la\u0300m m\u00f4\u0323t s\u00f4\u0301 s\u01a1\u0323i len trong \u0111o\u0301 m\u00e2\u0301t \u0111i\u00ea\u0323n ti\u0301ch, chu\u0301ng se\u0303 mang \u0111i\u00ea\u0323n ti\u0301ch d\u01b0\u01a1ng, \u0111\u00f4\u0300ng th\u01a1\u0300i m\u00f4\u0323t s\u00f4\u0301 s\u01a1\u0323i kha\u0301c do nh\u00e2\u0323n \u0111\u01b0\u01a1\u0323c \u00ea-le\u0301c-tr\u00f4n n\u00ean mang \u0111i\u00ea\u0323n ti\u0301ch \u00e2m. Do ca\u0301c \u00ea-le\u0301c-tr\u00f4n \u0111\u01b0\u01a1\u0323c sinh ra t\u01b0\u0300 ca\u0301c s\u01a1\u0323i len r\u00e2\u0301t kho\u0301 di chuy\u00ea\u0309n tr\u00ean s\u01a1\u0323i t\u00f4\u0309ng h\u01a1\u0323p n\u00ean \u0111a\u0303 hi\u0300nh tha\u0300nh hi\u00ea\u0323n t\u01b0\u01a1\u0323ng ti\u0301ch \u0111i\u00ea\u0323n. Khi ti\u0301ch \u0111i\u00ea\u0323n t\u01a1\u0301i m\u00f4\u0323t m\u01b0\u0301c \u0111\u00f4\u0323 nh\u00e2\u0301t \u0111i\u0323nh se\u0303 sinh ra hi\u00ea\u0323n t\u01b0\u01a1\u0323ng pho\u0301ng \u0111i\u00ea\u0323n, pha\u0301t ra nh\u01b0\u0303ng ti\u00ea\u0301ng n\u00f4\u0309 la\u0301ch ta\u0301ch va\u0300 tia l\u01b0\u0309a \u0111i\u00ea\u0323n. Th\u01b0\u0323c ra, hi\u00ea\u0323n t\u01b0\u01a1\u0323ng pho\u0301ng \u0111i\u00ea\u0323n r\u00e2\u0301t th\u01b0\u01a1\u0300ng g\u0103\u0323p trong cu\u00f4\u0323c s\u00f4\u0301ng ha\u0300ng nga\u0300y cu\u0309a chu\u0301ng ta. Vi\u0301 du\u0323, khi ta du\u0300ng l\u01b0\u01a1\u0323c nh\u01b0\u0323a cha\u0309i to\u0301c kh\u00f4, to\u0301c cu\u0303ng se\u0303 pha\u0301t ra ti\u00ea\u0301ng n\u00f4\u0309 la\u0301ch ta\u0301ch nh\u01b0 v\u00e2\u0323y. B\u01a1\u0309i vi\u0300 l\u01b0\u01a1\u0323c nh\u01b0\u0323a la\u0300 ch\u00e2\u0301t kh\u00f4ng d\u00e2\u0303n \u0111i\u00ea\u0323n; vi\u0300 th\u00ea\u0301 trong qua\u0301 tri\u0300nh co\u0323 sa\u0301t cu\u0303ng sinh ra hi\u00ea\u0323n t\u01b0\u01a1\u0323ng ti\u0301ch \u0111i\u00ea\u0323n va\u0300 pho\u0301ng \u0111i\u00ea\u0323n. Khi \u01a1\u0309 trong m\u00f4i tr\u01b0\u01a1\u0300ng \u00e2\u0309m \u01b0\u01a1\u0301t, a\u0301o la\u0300m t\u01b0\u0300 len t\u00f4\u0309ng h\u01a1\u0323p va\u0300 to\u0301c ng\u01b0\u01a1\u0300i cu\u0303ng co\u0301 th\u00ea\u0309 d\u00e2\u0303n \u0111i\u00ea\u0323n \u01a1\u0309 m\u01b0\u0301c \u0111\u00f4\u0323 nh\u00e2\u0301t \u0111i\u0323nh. Vi\u0300 th\u00ea\u0301, c\u01a1\u0309i qu\u00e2\u0300n a\u0301o hay cha\u0309i to\u0301c va\u0300o ti\u00ea\u0301t tr\u01a1\u0300i \u00e2\u0309m \u01b0\u01a1\u0301t se\u0303 r\u00e2\u0301t i\u0301t khi xa\u0309y ra hi\u00ea\u0323n t\u01b0\u01a1\u0323ng pho\u0301ng tia l\u01b0\u0309a \u0111i\u00ea\u0323n.<\/p>\n\n\n\n
\u0110i\u00ea\u0323n a\u0301p khi pho\u0301ng \u0111i\u00ea\u0323n cu\u0309a ca\u0301c loa\u0323i s\u01a1\u0323i t\u00f4\u0301ng h\u01a1\u0323p nh\u01b0 len t\u00f4\u0309ng h\u01a1\u0323p terylen co\u0301 th\u00ea\u0309 l\u00ean t\u01a1\u0301i va\u0300i va\u0323n v\u00f4n. \u0110i\u00ea\u0323n a\u0301p cao nh\u01b0 v\u00e2\u0323y co\u0301 th\u00ea\u0309 g\u00e2y th\u01b0\u01a1ng ti\u0301ch cho con ng\u01b0\u01a1\u0300i kh\u00f4ng? C\u00e2u tra\u0309 l\u01a1\u0300i la\u0300 kh\u00f4ng vi\u0300 \u0111i\u00ea\u0323n l\u01b0\u01a1\u0323ng cu\u0309a chu\u0301ng r\u00e2\u0301t i\u0301t. Th\u00f4ng th\u01b0\u01a1\u0300ng m\u00e2\u0323t \u0111\u00f4\u0323 \u0111i\u00ea\u0323n ti\u0301ch tr\u00ean m\u00f4\u0303i me\u0301t vu\u00f4ng va\u0309i chi co\u0301 h\u01a1n 10 micr\u00f4 cul\u00f4ng \u00ea-le\u0301c-tron, do \u0111o\u0301 du\u0300 co\u0301 pho\u0301ng \u0111i\u00ea\u0323n thi\u0300 c\u01a1 th\u00ea\u0309 ng\u01b0\u01a1\u0300i cu\u0303ng kh\u00f4ng a\u0309nh h\u01b0\u01a1\u0309ng \u0111\u00ea\u0301n c\u01a1 th\u00ea\u0309. Theo nghi\u00ean c\u01b0\u0301u cu\u0309a m\u00f4\u0323t s\u00f4\u0301 chuy\u00ean gia<\/a> v\u00ea\u0300 y ho\u0323c, hi\u00ea\u0323n t\u01b0\u01a1\u0323ng pho\u0301ng \u0111i\u00ea\u0323n nh\u01b0 v\u00e2\u0323y kh\u00f4ng nh\u01b0\u0303ng kh\u00f4ng g\u00e2y t\u00f4\u0309n ha\u0323i \u0111\u00ea\u0301n c\u01a1 th\u00ea\u0309 ma\u0300 co\u0300n co\u0301 ta\u0301c du\u0323ng \u0111i\u00ea\u0300u tri\u0323 \u0111\u00f4\u0301i v\u01a1\u0301i m\u00f4\u0323t s\u00f4\u0301 b\u00ea\u0323nh nh\u01b0 \u0111au d\u00e2y th\u00e2\u0300n kinh, vi\u00eam kh\u01a1\u0301p do th\u01a1\u0300i ti\u00ea\u0301t \u00e2\u0309m th\u00e2\u0301p.<\/p>\n\n\n\n Mo\u0323i ng\u01b0\u01a1\u0300i th\u01b0\u01a1\u0300ng thi\u0301ch m\u0103\u0323c qu\u00e2\u0300n a\u0301o t\u01b0\u0300 va\u0309i b\u00f4ng nguy\u00ean ch\u00e2\u0301t vi\u0300 no\u0301 kh\u00f4ng xa\u0309y ra hi\u00ea\u0323n t\u01b0\u01a1\u0323ng pho\u0301ng \u0111i\u00ea\u0323n. Ta\u0323i sao v\u00e2\u0323y? \u0110o\u0301 la\u0300 do qu\u00e2\u0300n a\u0301o la\u0300m t\u01b0\u0300 va\u0309i b\u00f4ng nguy\u00ean ch\u00e2\u0301t co\u0301 ti\u0301nh hu\u0301t \u00e2\u0309m kha\u0301 t\u00f4\u0301t; ti\u0301nh ca\u0301ch \u0111i\u00ea\u0323n cu\u0309a chu\u0301ng ke\u0301m vi\u0300 th\u00ea\u0301 chu\u0301ng kh\u00f4ng th\u00ea\u0309 ti\u0301ch tr\u01b0\u0303 \u0111i\u00ea\u0323n ti\u0301ch \u00e2m hay \u0111i\u00ea\u0323n ti\u0301ch d\u01b0\u01a1ng. Do \u0111o\u0301 kh\u00f4ng co\u0301 hi\u00ea\u0323n t\u01b0\u01a1\u0323ng ti\u0301ch \u0111i\u00ea\u0323n, n\u00ean cu\u0303ng kh\u00f4ng co\u0301 hi\u00ea\u0323n t\u01b0\u01a1\u0323ng pho\u0301ng \u0111i\u00ea\u0323n.<\/p>\n","protected":false},"excerpt":{"rendered":" Va\u0300o mu\u0300a \u0111\u00f4ng, khi ba\u0323n c\u01a1\u0309i nh\u01b0\u0303ng b\u00f4\u0323 qu\u00e2\u0300n a\u0301o len la\u0300m t\u01b0\u0300 s\u01a1\u0323i t\u00f4\u0309ng h\u01a1\u0323p ra ba\u0323n th\u01b0\u01a1\u0300ng nghe th\u00e2\u0301y nh\u01b0\u0303ng ti\u00ea\u0301ng n\u00f4\u0309 “la\u0301ch ta\u0301ch” r\u00e2\u0301t nho\u0309. N\u00ea\u0301u ba\u0323n c\u01a1\u0309i qu\u00e2\u0300n a\u0301o len va\u0300o bu\u00f4\u0309i t\u00f4\u0301i hay \u01a1\u0309 ch\u00f4\u0303 t\u00f4\u0301i ba\u0323n co\u0300n nhi\u0300n ro\u0303 nh\u01b0\u0303ng tia l\u01b0\u0309a \u0111i\u00ea\u0323n pha\u0301t ra t\u01b0\u0300 b\u00ea\u0300 m\u0103\u0323t qu\u00e2\u0300n […]<\/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":[1,15],"tags":[],"class_list":["post-11573","post","type-post","status-publish","format-standard","hentry","category-general","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11573","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=11573"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/11573\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=11573"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=11573"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=11573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}