C\u00e2u 1:<\/b>\u00a0T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng c\u01a1 ph\u1ee5 thu\u1ed9c v\u00e0o<\/p>\n
A. c\u01b0\u1eddng \u0111\u1ed9 s\u00f3ng<\/p>\n
B. ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng<\/p>\n
C. bi\u00ean \u0111\u1ed9 s\u00f3ng<\/p>\n
D. b\u1ea3n ch\u1ea5t m\u00f4i tr\u01b0\u1eddng truy\u1ec1n s\u00f3ng.<\/p>\n
C\u00e2u 2:<\/b>\u00a0Ngu\u1ed3n s\u00f3ng \u1edf O dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 10 Hz, dao \u0111\u1ed9ng truy\u1ec1n \u0111i v\u1edbi t\u1ed1c \u0111\u1ed9 0,4 m\/s tr\u00ean ph\u01b0\u01a1ng Ox. Tr\u00ean ph\u01b0\u01a1ng n\u00e0y c\u00f3 hai \u0111i\u1ec3m P v\u00e0 Q, theo th\u1ee9 t\u1ef1 \u0111\u00f3 PQ = 15 cm. Cho bi\u00ean \u0111\u1ed9 c\u1ee7a s\u00f3ng a = 1 cm v\u00e0 kh\u00f4ng thay \u0111\u1ed5i khi s\u00f3ng truy\u1ec1n \u0111i. N\u1ebfu t\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0o \u0111\u00f3 P c\u00f3 li \u0111\u1ed9 1 cm th\u00ec li \u0111\u1ed9 t\u1ea1i Q l\u00e0<\/p>\n
A. 0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 2 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 1 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. -1 cm<\/p>\n
C\u00e2u 3:<\/b>\u00a0M\u1ed9t s\u00f3ng c\u01a1 truy\u1ec1n d\u1ecdc theo tr\u1ee5c Ox v\u1edbi ph\u01b0\u01a1ng tr\u00ecnh u = acos(40x \u2013 3000t). Trong \u0111\u00f3, x l\u00e0 t\u1ecda \u0111\u1ed9 t\u00ednh b\u1eb1ng m, t t\u00ednh b\u1eb1ng s. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng l\u00e0<\/p>\n
A. 50 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 75 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 100 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 125 m\/s.<\/p>\n
C\u00e2u 4:<\/b>\u00a0Cho ph\u01b0\u01a1ng tr\u00ecnh s\u00f3ng<\/p>\n
<\/p>\n
trong \u0111\u00f3 x t\u00ednh b\u1eb1ng cm, t t\u00ednh b\u1eb1ng gi\u00e2y. Chu k\u00ec v\u00e0 b\u01b0\u1edbc s\u00f3ng \u0111\u00e3 cho c\u00f3 gi\u00e1 tr\u1ecb t\u01b0\u01a1ng \u1ee9ng l\u00e0<\/p>\n
A. 0,05 s ; 10 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 0,1 s ; 4 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 0,05 s ; 20 cm \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 0,1 s ; 8 cm.<\/p>\n
C\u00e2u 5:<\/b>\u00a0Tr\u00ean m\u1eb7t n\u01b0\u1edbc c\u00f3 hai ngu\u1ed3n k\u1ebft h\u1ee3p dao \u0111\u1ed9ng ng\u01b0\u1ee3c pha nhau, v\u1edbi c\u00e1c bi\u00ean \u0111\u1ed9 kh\u00e1c nhau, ph\u00e1t s\u00f3ng c\u00f3 b\u01b0\u1edbc s\u00f3ng 3 cm. Bi\u1ebft AB = 25 cm. S\u1ed1 \u0111i\u1ec3m dao \u0111\u1ed9ng v\u1edbi bi\u00ean \u0111\u1ed9 c\u1ef1c \u0111\u1ea1i, bi\u00ean \u0111\u1ed9 c\u1ef1c ti\u1ec3u trong kho\u1ea3ng (A, B) l\u1ea7n l\u01b0\u1ee3t l\u00e0<\/p>\n
A. 16 ; 17 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 17 ; 1\u00a0 \u00a0 \u00a0 \u00a0 C. 14 ; 15 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 19 ; 18<\/p>\n
C\u00e2u 6:<\/b>\u00a0Trong m\u1ed9t th\u00ed nghi\u1ec7m giao thoa s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc, hai ngu\u1ed3n k\u1ebft h\u1ee3p A, B dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 28 Hz. T\u1ea1i m\u1ed9t \u0111i\u1ec3m M c\u00e1ch c\u00e1c ngu\u1ed3n A, B l\u1ea7n l\u01b0\u1ee3t nh\u1eefng kho\u1ea3ng c\u00e1ch d1<\/sub>\u00a0= 21 cm; d2<\/sub>\u00a0= 25 cm, s\u00f3ng c\u00f3 bi\u00ean \u0111\u1ed9 c\u1ef1c \u0111\u1ea1i. Gi\u1eefa M v\u00e0 \u0111\u01b0\u1eddng trung tr\u1ef1c c\u1ee7a AB c\u00f3 ba v\u00e2n c\u1ef1c \u0111\u1ea1i kh\u00e1c. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc l\u00e0<\/p>\n A. 37 cm\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 112 cm\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 28 cm\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D.0,57 cm\/s.<\/p>\n C\u00e2u 7:<\/b>\u00a0T\u00ecm ph\u00e1t bi\u1ec3u sai<\/p>\n A. S\u00f3ng \u00e2m ch\u1ec9 truy\u1ec1n \u0111\u01b0\u1ee3c trong kh\u00f4ng kh\u00ed.<\/p>\n B. S\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn h\u01a1n 20000 Hz g\u1ecdi l\u00e0 s\u00f3ng si\u00eau \u00e2m.<\/p>\n C. S\u00f3ng \u00e2m c\u00f3 t\u1ea7n s\u1ed1 nh\u1ecf h\u01a1n 16 Hz g\u1ecdi l\u00e0 s\u00f3ng h\u1ea1 \u00e2m.<\/p>\n D. S\u00f3ng \u00e2m v\u00e0 c\u00e1c s\u00f3ng c\u01a1 h\u1ecdc kh\u00e1c c\u00f3 c\u00f9ng b\u1ea3n ch\u1ea5t.<\/p>\n H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n C\u00e2u 2:<\/b>\u00a0A<\/p>\n <\/p>\n C\u00e2u 3:<\/b>\u00a0B<\/p>\n <\/p>\n C\u00e2u 4:<\/b>\u00a0B<\/p>\n \u0110\u1ed1i chi\u1ebfu v\u1edbi ph\u01b0\u01a1ng tr\u00ecnh s\u00f3ng t\u1ed5ng qu\u00e1t ta c\u00f3 :<\/p>\n <\/p>\n C\u00e2u 5:<\/b>\u00a0A<\/p>\n V\u00ec hai ngu\u1ed3n dao \u0111\u1ed9ng ng\u01b0\u1ee3c pha n\u00ean t\u1ea1i trung \u0111i\u1ec3m I c\u00f3 c\u1ef1c ti\u1ec3u giao thoa.<\/p>\n C\u00e1c c\u1ef1c ti\u1ec3u c\u00e1ch nhau 0,5\u03bb = 1,5 cm<\/p>\n <\/p>\n C\u00e2u 6:<\/b>\u00a0C<\/p>\n \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c d2<\/sub>-d1<\/sub>=k\u03bb v\u00e0 bi\u1ebft d1<\/sub>=21 cm , d2<\/sub>=25 cm , k =4<\/p>\n T\u00ecm \u0111\u01b0\u1ee3c : 4 = 4\u03bb \u21d2 \u03bb = 1 cm<\/p>\n T\u1eeb \u0111\u00f3 : v = \u03bbf = 1.28 = 28 cm\/s<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e2u 1:\u00a0T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng c\u01a1 ph\u1ee5 thu\u1ed9c v\u00e0o A. c\u01b0\u1eddng \u0111\u1ed9 s\u00f3ng B. ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng C. bi\u00ean \u0111\u1ed9 s\u00f3ng D. b\u1ea3n ch\u1ea5t m\u00f4i tr\u01b0\u1eddng truy\u1ec1n s\u00f3ng. C\u00e2u 2:\u00a0Ngu\u1ed3n s\u00f3ng \u1edf O dao \u0111\u1ed9ng v\u1edbi t\u1ea7n s\u1ed1 10 Hz, dao \u0111\u1ed9ng truy\u1ec1n \u0111i v\u1edbi t\u1ed1c \u0111\u1ed9 0,4 m\/s tr\u00ean ph\u01b0\u01a1ng Ox. Tr\u00ean ph\u01b0\u01a1ng n\u00e0y […]<\/p>\n","protected":false},"author":3,"featured_media":26253,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[158],"tags":[1445,1444],"yoast_head":"\n\n\n
\n C\u00e2u<\/td>\n 1<\/td>\n 2<\/td>\n 3<\/td>\n 4<\/td>\n 5<\/td>\n 6<\/td>\n 7<\/td>\n<\/tr>\n \n \u0110\u00e1p \u00e1n<\/td>\n D<\/td>\n A<\/td>\n B<\/td>\n B<\/td>\n A<\/td>\n C<\/td>\n A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n