Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Ti\u1ebfp n\u1ed1i chuy\u00ean \u0111\u1ec1 v\u1ec1 \u00e2m thanh, \u1edf b\u00e0i vi\u1ebft tr\u01b0\u1edbc ch\u00fang ta \u0111\u00e3 t\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ed9 to c\u1ee7a \u00e2m. Trong b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay, ch\u00fang ta s\u1ebd c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u1ec1 m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m. \u0110\u00e3 bao gi\u1edd, c\u00e1c em t\u1ef1 h\u1ecfi, \u00e2m thanh c\u00f3 th\u1ec3 truy\u1ec1n \u0111i truy\u1ec1n \u0111i trong m\u00f4i tr\u01b0\u1eddng n\u00e0o hay ch\u01b0a? \u1ede \u0111\u00e2u th\u00ec ch\u00fang ta c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c \u00e2m thanh truy\u1ec1n \u0111\u1ebfn tai ta? \u0110\u00e2y ch\u00ednh l\u00e0 nh\u1eefng c\u00e2u h\u1ecfi \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi th\u1eafc m\u1eafc. Ch\u00fang ta h\u00e3y c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u00e0 gi\u1ea3i \u0111\u00e1p trong b\u00e0i vi\u1ebft n\u00e0y nh\u00e9!<\/p>\n\n\n\n
V\u00ed d\u1ee5 v\u1ec1 m\u00f4i tr\u01b0\u1eddng \u00e2m<\/p>\n\n\n\n
Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng \u2013 m\u00f4i tr\u01b0\u1eddng \u00e2m<\/p>\n\n\n\n
\u0110\u1ec3 c\u00e1c em c\u00f3 ki\u1ebfn th\u1ee9c t\u1ed5ng qu\u00e1t h\u01a1n v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y, ch\u00fang t\u00f4i s\u1ebd nh\u1eafc l\u1ea1i nh\u1eefng ki\u1ebfn th\u1ee9c chung v\u1ec1 \u00e2m. \u00c2m thanh \u0111\u01b0\u1ee3c ph\u00e1t ra nh\u1edd s\u1ef1 dao \u0111\u1ed9ng c\u1ee7a v\u1eadt. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng \u1ea3nh h\u01b0\u1edfng nhi\u1ec1u \u0111\u1ebfn \u0111\u1ed9 to c\u1ee7a \u00e2m thanh. Khi v\u1eadt dao \u0111\u1ed9ng, kho\u1ea3ng c\u00e1ch l\u1edbn nh\u1ea5t c\u1ee7a v\u1eadt v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a v\u1eadt. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u00e0ng l\u1edbn th\u00ec \u00e2m thanh c\u1ee7a v\u1eadt c\u00e0ng to. \u0110i\u1ec1u n\u00e0y ch\u00fang ta c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng ki\u1ec3m ch\u1ee9ng trong c\u00e1c hi\u1ec7n t\u01b0\u1ee3ng th\u01b0\u1eddng ng\u00e0y. M\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m c\u0169ng c\u00f3 \u1ea3nh h\u01b0\u1edfng \u00edt nhi\u1ec1u \u0111\u1ebfn \u00e2m thanh.<\/p>\n\n\n\n
\u0110\u1ed9 to c\u1ee7a \u00e2m \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb \u0111\u1ec1 \u2013 xi \u2013 ben hay c\u00f2n \u0111\u01b0\u1ee3c k\u00ed hi\u1ec7u l\u00e0 dB. M\u1ecdi \u00e2m thanh \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb n\u00e0y. Tuy nhi\u00ean, tr\u00ean th\u1ef1c t\u1ebf, v\u1eabn c\u00f3 nhi\u1ec1u \u0111\u01a1n v\u1ecb kh\u00e1c d\u00f9ng \u0111\u1ec3 \u0111o \u0111\u1ed9 l\u1edbn c\u1ee7a \u00e2m thanh. C\u00e1c em c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u th\u00eam \u0111\u1ec3 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng l\u00e0m b\u00e0i t\u1eadp tr\u00ean l\u1edbp. Gi\u1ed1ng v\u1edbi nh\u1eefng \u0111\u01a1n v\u1ecb kh\u00e1c, \u0111\u01a1n v\u1ecb c\u1ee7a \u00e2m thanh c\u0169ng c\u00f3 th\u1ec3 quy \u0111\u1ed5i, chuy\u1ec3n \u0111\u1ed5i d\u1ec5 d\u00e0ng. C\u00e1c em h\u00e3y tham kh\u1ea3o b\u1ea3ng \u0111\u01a1n v\u1ecb \u0111o \u00e2m thanh nh\u00e9!<\/p>\n\n\n\n
Nh\u1eefng \u00e2m thanh kh\u00e1c nhau c\u00f3 \u0111\u1ed9 l\u1edbn kh\u00e1c nhau. Ch\u00ednh v\u00ec v\u1eady, kh\u00f4ng ph\u1ea3i b\u1ea5t c\u1ee9 \u00e2m thanh n\u00e0o ch\u00fang ta c\u0169ng c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c. Ch\u01b0a k\u1ec3 \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng \u00e2m c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u00e2m thanh. Trong m\u1ed9t s\u1ed1 m\u00f4i tr\u01b0\u1eddng nh\u1ea5t \u0111\u1ecbnh, ch\u00fang ta kh\u00f4ng th\u1ec3 nghe th\u1ea5y \u00e2m thanh. \u0110\u00f3 ch\u00ednh l\u00e0 l\u00fd do ch\u00fang ta c\u1ea7n ph\u1ea3i t\u00ecm hi\u1ec3u v\u1ec1 m\u00f4i tr\u01b0\u1eddng \u00e2m thanh c\u00f3 th\u1ec3 truy\u1ec1n qua.<\/p>\n\n\n\n
M\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m l\u00e0 g\u00ec?<\/p>\n\n\n\n
M\u00f4i tr\u01b0\u1eddng \u00e2m l\u00e0 m\u00f4i tr\u01b0\u1eddng cho ph\u00e9p \u00e2m thanh \u0111i qua. \u1ede trong m\u00f4i tr\u01b0\u1eddng n\u00e0y, \u00e2m thanh c\u00f3 th\u1ec3 truy\u1ec1n t\u1eeb v\u1ecb tr\u00ed n\u00e0y \u0111\u1ebfn v\u1ecb tr\u00ed kh\u00e1c. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, m\u00f4i tr\u01b0\u1eddng \u00e2m cho ph\u00e9p ch\u00fang ta nghe \u0111\u01b0\u1ee3c \u00e2m thanh. Ngu\u1ed3n \u00e2m l\u00e0 n\u01a1i ph\u00e1t ra \u00e2m thanh. Trong m\u00f4i tr\u01b0\u1eddng n\u00e0y, \u00e2m thanh \u0111i t\u1eeb ngu\u1ed3n \u00e2m \u0111\u1ebfn tai ta ho\u1eb7c \u0111\u1ebfn v\u1ecb tr\u00ed thu \u00e2m.<\/p>\n\n\n\n
Hi\u1ec3u m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m cho ph\u00e9p \u00e2m thanh \u0111i qua. \u0110\u00e2y ch\u00ednh l\u00e0 c\u00e1ch hi\u1ec3u \u0111\u01a1n gi\u1ea3n nh\u1ea5t v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y. C\u00f3 r\u1ea5t nhi\u1ec1u m\u00f4i tr\u01b0\u1eddng cho ph\u00e9p \u00e2m thanh \u0111i t\u1eeb v\u1ecb tr\u00ed n\u00e0y \u0111\u1ebfn v\u1ecb tr\u00ed kh\u00e1c. Tuy nhi\u00ean, \u0111\u1ed9 l\u1edbn c\u1ee7a \u00e2m thanh, c\u0169ng nh\u01b0 v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m trong c\u00e1c m\u00f4i tr\u01b0\u1eddng c\u00f3 s\u1ef1 kh\u00e1c nhau. C\u00e1c em n\u00ean h\u1ecdc theo t\u1eebng m\u00f4i tr\u01b0\u1eddng \u0111\u1ec3 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c h\u01a1n.<\/p>\n\n\n\n
T\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m<\/p>\n\n\n\n
C\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m<\/p>\n\n\n\n
\u00c2m thanh c\u00f3 th\u1ec3 \u0111i qua trong c\u00e1c m\u00f4i tr\u01b0\u1eddng ch\u1ea5t r\u1eafn, l\u1ecfng, kh\u00ed. \u00c2m thanh kh\u00f4ng th\u1ec3 truy\u1ec1n \u0111i trong m\u00f4i tr\u01b0\u1eddng ch\u00e2n kh\u00f4ng. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fd thuy\u1ebft c\u01a1 b\u1ea3n v\u1ec1 c\u00e1c m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m. \u1ede trong t\u1ea5t c\u1ea3 c\u00e1c m\u00f4i tr\u01b0\u1eddng, \u1edf c\u00e1ch xa ngu\u1ed3n \u00e2m th\u00ec \u00e2m nghe \u0111\u01b0\u1ee3c c\u00e0ng nh\u1ecf. \u00c2m thanh ch\u00fang ta nghe \u0111\u01b0\u1ee3c nh\u1ecf hay l\u1edbn c\u00f2n ph\u1ee5 thu\u1ed9c v\u00e0o v\u1ecb tr\u00ed ngu\u1ed3n \u00e2m. Khi ngu\u1ed3n \u00e2m \u1edf qu\u00e1 xa, ch\u00fang ta s\u1ebd kh\u00f4ng th\u1ec3 nghe th\u1ea5y nh\u1eefng \u00e2m thanh n\u00e0y. \u00c2m truy\u1ec1n \u0111i s\u1ebd nh\u1ecf d\u1ea7n ch\u1ee9 kh\u00f4ng gi\u1eef nguy\u00ean \u0111\u1ed9 l\u1edbn.<\/p>\n\n\n\n
Th\u1ef1c t\u1ebf nghi\u00ean c\u1ee9u cho th\u1ea5y, khi \u00e2m thanh truy\u1ec1n \u0111i. \u00c2m thanh s\u1ebd b\u1ecb h\u1ea5p th\u1ee5 d\u1ea7n n\u00ean c\u00e0ng xa ngu\u1ed3n \u00e2m s\u1ebd c\u00e0ng nh\u1ecf d\u1ea7n. N\u00ean \u1edf nh\u1eefng v\u1ecb tr\u00ed qu\u00e1 xa ngu\u1ed3n \u00e2m s\u1ebd kh\u00f4ng th\u1ec3 nghe th\u1ea5y \u00e2m thanh truy\u1ec1n \u0111\u1ebfn.<\/p>\n\n\n\n
V\u1eadn t\u1ed1c truy\u1ec1n \u00e2m<\/p>\n\n\n\n
\u1ede c\u00e1c m\u00f4i tr\u01b0\u1eddng kh\u00e1c nhau, v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m c\u0169ng kh\u00e1c nhau. V\u00ed d\u1ee5 t\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m d\u01b0\u1edbi n\u01b0\u1edbc s\u1ebd kh\u00e1c v\u1edbi t\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m trong kh\u00f4ng kh\u00ed. Trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd l\u1edbp 7, c\u00e1c em ch\u01b0a c\u1ea7n t\u00ecm hi\u1ec3u chuy\u00ean s\u00e2u v\u1ec1 \u0111i\u1ec1u n\u00e0y. Tuy nhi\u00ean, c\u00e1c em v\u1eabn n\u00ean ghi nh\u1edb nh\u1eefng k\u1ebft qu\u1ea3 nghi\u00ean c\u1ee9u \u0111\u1ec3 c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng v\u00e0o b\u00e0i t\u1eadp. T\u1ed1c \u0111\u1ed9 \u00e2m thanh trong c\u00e1c m\u00f4i tr\u01b0\u1eddng \u00e2m \u0111\u01b0\u1ee3c x\u1ebfp lo\u1ea1i t\u1eeb l\u1edbn \u0111\u1ebfn b\u00e9. \u1ede 200C, v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 340 m\/s; trong n\u01b0\u1edbc l\u00e0 1500 m\/s; trong th\u00e9p l\u00e0 6100 m\/s.<\/p>\n\n\n\n
T\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m trong m\u00f4i tr\u01b0\u1eddng ch\u1ea5t r\u1eafn l\u1edbn h\u01a1n trong ch\u1ea5t l\u1ecfng, trong ch\u1ea5t l\u1ecfng l\u1edbn h\u01a1n trong ch\u1ea5t kh\u00ed. M\u00f4i tr\u01b0\u1eddng ch\u1ea5t r\u1eafn c\u00f3 v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m nhanh nh\u1ea5t. Hay n\u00f3i c\u00e1ch kh\u00e1c, ch\u1ea5t r\u1eafn l\u00e0 m\u00f4i tr\u01b0\u1eddng chuy\u00ean \u00e2m t\u1ed1t nh\u1ea5t. C\u00e1c b\u1ea1n c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m \u00e1p tai xu\u1ed1ng m\u1eb7t b\u00e0n. Sau \u0111\u00f3 t\u00e1c \u0111\u1ed9ng m\u1ed9t l\u1ef1c nh\u1eb9 g\u00f5 l\u00ean b\u00e0n, c\u00e1c b\u1ea1n s\u1ebd nghe th\u1ea5y ti\u1ebfng \u0111\u1ed9ng nhanh ch\u00f3ng. M\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m nhanh th\u1ee9 hai trong b\u1ea3ng x\u1ebfp h\u1ea1ng ch\u00ednh l\u00e0 ch\u1ea5t l\u1ecfng.<\/p>\n\n\n\n
\u0110i\u1ec1u n\u00e0y th\u1eadt b\u1ea5t ng\u1edd \u0111\u00fang kh\u00f4ng n\u00e0o? Ch\u00fang ta v\u1eabn th\u01b0\u1eddng s\u1eed d\u1ee5ng truy\u1ec1n \u00e2m nhi\u1ec1u nh\u1ea5t trong kh\u00f4ng kh\u00ed. Tuy nhi\u00ean, d\u01b0\u1edbi n\u01b0\u1edbc l\u1ea1i l\u00e0 m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m t\u1ed1t h\u01a1n. M\u00f4i tr\u01b0\u1eddng \u00e2m kh\u00f4ng kh\u00ed l\u00e0 lo\u1ea1i ch\u00fang ta th\u01b0\u1eddng s\u1eed d\u1ee5ng nhi\u1ec1u nh\u1ea5t. Khi ch\u00fang ta n\u00f3i ngh\u0129a l\u00e0 \u0111\u00e3 ph\u00e1t ra \u00e2m thanh truy\u1ec1n \u0111i trong kh\u00f4ng kh\u00ed \u0111\u1ebfn tai ng\u01b0\u1eddi g\u1ea7n \u0111\u00f3. M\u00f4i tr\u01b0\u1eddng \u00e2m c\u00f3 th\u1ec3 truy\u1ec1n \u0111i nhi\u1ec1u \u00e2m thanh c\u00f9ng l\u00fac. \u0110\u00f3 ch\u00ednh l\u00e0 l\u00fd do v\u00ec sao ch\u00fang ta th\u01b0\u1eddng nghe th\u1ea5y nhi\u1ec1u t\u1ea1p \u00e2m, \u00e2m thanh c\u00f9ng l\u00fac.<\/p>\n\n\n\n
Th\u00f4ng tin v\u1ec1 m\u00f4i tr\u01b0\u1eddng \u00e2m<\/p>\n\n\n\n
C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 m\u00f4i tr\u01b0\u1eddng \u00e2m<\/p>\n\n\n\n
\u0110\u1ed1i v\u1edbi ch\u1ee7 \u0111\u1ec1 n\u00e0y, c\u00e1c em s\u1ebd c\u00f3 nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan. Nh\u1eefng b\u00e0i t\u1eadp t\u1eeb t\u00ednh to\u00e1n \u0111\u1ebfn b\u00e0i t\u1eadp th\u1ef1c t\u1ebf. Ch\u00fang t\u00f4i \u0111\u00e3 t\u1ed5ng h\u1ee3p m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i ti\u00eau bi\u1ec3u d\u01b0\u1edbi \u0111\u00e2y. C\u00e1c em h\u00e3y \u0111\u1ecdc tham kh\u1ea3o v\u00e0 ghi ch\u00e9p l\u1ea1i \u0111\u1ec3 v\u1eadn d\u1ee5ng nh\u00e9!<\/p>\n\n\n\n
T\u00ednh v\u1eadn t\u1ed1c, qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 th\u1eddi gian truy\u1ec1n \u00e2m<\/p>\n\n\n\n
D\u1ea1ng b\u00e0i n\u00e0y s\u1ebd y\u00eau c\u1ea7u c\u00e1c em t\u00ednh to\u00e1n v\u1eadn t\u1ed1c, qu\u00e3ng \u0111\u01b0\u1eddng, ho\u1eb7c th\u1eddi gian truy\u1ec1n \u00e2m. D\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c d\u01b0\u1edbi \u0111\u00e2y c\u00f9ng nh\u1eefng d\u1eef ki\u1ec7n \u0111\u1ec1 b\u00e0i \u0111\u00e3 cho. C\u00e1c em ch\u1ec9 c\u1ea7n thay s\u1ed1 v\u00e0 l\u1eafp gh\u00e9p \u0111\u00fang c\u00f4ng th\u1ee9c l\u00e0 c\u00f3 th\u1ec3 l\u00e0m b\u00e0i. Tuy nhi\u00ean, c\u00e1c em c\u1ea7n ch\u00fa \u00fd, v\u1eadn t\u1ed1c, th\u1eddi gian, qu\u00e3ng \u0111\u01b0\u1eddng \u0111\u1ec1u ph\u1ea3i c\u1ee7a \u00e2m thanh \u0111\u00f3. N\u1ebfu kh\u00f4ng k\u1ebft qu\u1ea3 c\u00f3 th\u1ec3 b\u1ecb sai l\u1ec7ch.<\/p>\n\n\n\n
D\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c t\u00ednh v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m trong c\u00e1c m\u00f4i tr\u01b0\u1eddng:<\/p>\n\n\n\n
Trong \u0111\u00f3: v l\u00e0 v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m (m\/s)<\/p>\n\n\n\n
s l\u00e0 qu\u00e3ng \u0111\u01b0\u1eddng truy\u1ec1n \u00e2m (m)<\/p>\n\n\n\n
t l\u00e0 th\u1eddi gian truy\u1ec1n \u00e2m (s)<\/p>\n\n\n\n
X\u00e1c \u0111\u1ecbnh \u00e2m truy\u1ec1n trong m\u00f4i tr\u01b0\u1eddng n\u00e0o?<\/p>\n\n\n\n
\u0110\u1ec3 x\u00e1c \u0111\u1ecbnh \u00e2m truy\u1ec1n trong m\u00f4i tr\u01b0\u1eddng n\u00e0o ta th\u1ef1c hi\u1ec7n nh\u01b0 sau:<\/p>\n\n\n\n
\u2013 T\u00ednh v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m.<\/p>\n\n\n\n
\u2013 D\u1ef1a v\u00e0o v\u1eadn t\u1ed1c truy\u1ec1n \u00e2m trong c\u00e1c m\u00f4i tr\u01b0\u1eddng:<\/p>\n\n\n\n
vkh\u00f4ng kh\u00ed = 340 m\/s; vn\u01b0\u1edbc = 1500 m\/s; vth\u00e9p = 6100 m\/s\u2026<\/p>\n\n\n\n
T\u1eeb \u0111\u00f3 suy ra \u0111\u01b0\u1ee3c \u00e2m truy\u1ec1n trong m\u00f4i tr\u01b0\u1eddng n\u00e0o.<\/p>\n\n\n\n
V\u1edbi d\u1ea1ng b\u00e0i t\u1eadp n\u00e0y, c\u00e1c em c\u1ea7n nh\u1edb nh\u1eefng con s\u1ed1 ch\u1ec9 v\u1eadn t\u1ed1c trong m\u00f4i tr\u01b0\u1eddng \u00e2m. C\u00f3 th\u1ec3 \u0111\u1ec1 b\u00e0i s\u1ebd cho s\u1eb5n b\u1ea3ng s\u1ed1 li\u1ec7u n\u00e0y. Tuy nhi\u00ean c\u00e1c em v\u1eabn n\u00ean nh\u1edb \u0111\u1ec3 l\u00e0m b\u00e0i t\u1eadp nhanh ch\u00f3ng h\u01a1n. C\u00e1c em c\u00f3 th\u1ec3 l\u00e0m th\u1eadt nhi\u1ec1u b\u00e0i t\u1eadp d\u1ea1ng n\u00e0y \u0111\u1ec3 ghi nh\u1edb t\u1ed1t h\u01a1n. M\u1ed9t s\u1ed1 b\u00e0i t\u1eadp n\u00e2ng cao, s\u1ebd k\u1ebft h\u1ee3p c\u1ea3 hai d\u1ea1ng b\u00e0i t\u1eadp n\u00e0y. C\u00e1c em s\u1ebd ph\u1ea3i t\u00ednh v\u1eadn t\u1ed1c, sau \u0111\u00f3 x\u00e9t theo b\u1ea3ng \u0111\u1ec3 ch\u1ecdn \u0111\u01b0\u1ee3c m\u00f4i tr\u01b0\u1eddng ph\u00f9 h\u1ee3p nh\u1ea5t.<\/p>\n\n\n\n
B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m<\/p>\n\n\n\n
B\u00e0i t\u1eadp d\u1ea1ng tr\u1eafc nghi\u1ec7m ch\u1ee7 y\u1ebfu ki\u1ec3m tra l\u00fd thuy\u1ebft v\u1ec1 m\u00f4i tr\u01b0\u1eddng \u00e2m. Ch\u1ec9 c\u1ea7n n\u1eafm ch\u1eafc l\u00fd thuy\u1ebft, c\u00e1c em s\u1ebd ch\u1ecdn \u0111\u01b0\u1ee3c \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c v\u00e0 \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t. C\u00f3 th\u1ec3 s\u1ebd c\u00f3 nh\u1eefng \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c nh\u01b0ng ch\u01b0a \u0111\u1ea7y \u0111\u1ee7 \u00fd. C\u00e1c em n\u00ean \u0111\u1ecdc k\u1ef9 v\u00e0 ch\u1ecdn \u0111\u00e1p \u00e1n c\u00f3 \u0111\u1ea7y \u0111\u1ee7 th\u00f4ng tin.<\/p>\n\n\n\n
M\u1edf r\u1ed9ng ki\u1ebfn th\u1ee9c s\u00f3ng \u00e2m<\/p>\n\n\n\n
Nh\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i \u0111\u1ec1 c\u1eadp tr\u00ean \u0111\u00e2y. B\u00e0i vi\u1ebft \u0111\u00e3 bao g\u1ed3m c\u1ea3 l\u00fd thuy\u1ebft v\u00e0 v\u00ed d\u1ee5 th\u1ef1c t\u1ebf d\u1ec5 nh\u1edb. C\u00e1c em n\u00ean ghi ch\u00e9p v\u00e0 h\u1ecdc thu\u1ed9c nh\u1eefng v\u00ed d\u1ee5 n\u00e0y. Hy v\u1ecdng nh\u1eefng th\u00f4ng tin n\u00e0y c\u00f3 th\u1ec3 gi\u00fap \u00edch cho c\u00e1c em trong vi\u1ec7c h\u1ecdc t\u1eadp<\/a> b\u1ed9 m\u00f4n v\u1eadt l\u00fd 7. C\u1ea3m \u01a1n c\u00e1c em \u0111\u00e3 \u0111\u00f3n \u0111\u1ecdc b\u00e0i vi\u1ebft n\u00e0y. Nh\u1eefng ki\u1ebfn th\u1ee9c m\u1edbi trong b\u1ed9 m\u00f4n v\u1eadt l\u00fd s\u1ebd \u0111\u01b0\u1ee3c \u0111\u0103ng t\u1ea3i t\u1ea1i trang ch\u1ee7. C\u00e1c em h\u00e3y ch\u00fa \u00fd \u0111\u1ec3 \u0111\u00f3n \u0111\u1ecdc nh\u00e9! V\u00ed d\u1ee5 b<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Ti\u1ebfp n\u1ed1i chuy\u00ean \u0111\u1ec1 v\u1ec1 \u00e2m thanh, \u1edf b\u00e0i vi\u1ebft tr\u01b0\u1edbc ch\u00fang ta \u0111\u00e3 t\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ed9 to c\u1ee7a \u00e2m. Trong b\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay, ch\u00fang ta s\u1ebd c\u00f9ng nhau t\u00ecm hi\u1ec3u v\u1ec1 m\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m. \u0110\u00e3 bao gi\u1edd, c\u00e1c em t\u1ef1 h\u1ecfi, \u00e2m thanh c\u00f3 […]<\/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":[4,7],"tags":[],"class_list":["post-1209","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1209","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=1209"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1209\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}