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{"id":26270,"date":"2018-04-10T16:46:25","date_gmt":"2018-04-10T09:46:25","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=26270"},"modified":"2018-04-10T16:46:25","modified_gmt":"2018-04-10T09:46:25","slug":"bai-tap-trac-nghiem-vat-li-12-dac-trung-vat-li-cua-am-phan-1","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-dac-trung-vat-li-cua-am-phan-1\/","title":{"rendered":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: \u0110\u1eb7c tr\u01b0ng v\u1eadt l\u00ed c\u1ee7a \u00e2m (ph\u1ea7n 1)"},"content":{"rendered":"

C\u00e2u 1:<\/b>\u00a0Khi mu\u1ed1n n\u00f3i v\u1ec1 s\u00f3ng \u00e2m, ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai?<\/p>\n

A. \u1ede c\u00f9ng m\u1ed9t nhi\u1ec7t \u0111\u1ed9, t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed nh\u1ecf h\u01a1n t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng \u00e2m trong n\u01b0\u1edbc.<\/p>\n

B. S\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 s\u00f3ng d\u1ecdc.<\/p>\n

C. S\u00f3ng \u00e2m truy\u1ec1n \u0111\u01b0\u1ee3c trong c\u00e1c m\u00f4i tr\u01b0\u1eddng r\u1eafn, l\u1ecfng, kh\u00ed.<\/p>\n

D. S\u00f3ng \u00e2m truy\u1ec1n trong kh\u00f4ng kh\u00ed l\u00e0 s\u00f3ng ngang.<\/p>\n

C\u00e2u 2:<\/b>\u00a0Trong m\u1ed9t bu\u1ed5i h\u00f2a nh\u1ea1c, khi d\u00f9ng 10 chi\u1ebfc k\u00e8n \u0111\u1ed3ng th\u00ec t\u1ea1i ch\u1ed7 c\u1ee7a m\u1ed9t kh\u00e1n gi\u1ea3 \u0111o \u0111\u01b0\u1ee3c m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2n 50 dB. Cho bi\u1ebft c\u00e1c chi\u1ebfc k\u00e8n \u0111\u1ed3ng gi\u1ed1ng nhau, khi th\u1ed5i ph\u00e1t ra c\u00f9ng c\u01b0\u1eddng \u0111\u1ed9 \u00e2m t\u1ea1i v\u1ecb tr\u00ed \u0111ang x\u00e9t. \u0110\u1ec3 t\u1ea1i ch\u1ed7 kh\u00e1n gi\u1ea3 \u0111\u00f3 c\u00f3 m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m l\u00e0 60 dB th\u00ec s\u1ed1 k\u00e8n \u0111\u1ed3ng ph\u1ea3i d\u00f9ng l\u00e0<\/p>\n

A. 50 chi\u1ebfc \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 100 chi\u1ebfc \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 80 chi\u1ebfc \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 90 chi\u1ebfc.<\/p>\n

C\u00e2u 3:<\/b>\u00a0\u0110\u1ed1i v\u1edbi \u00e2m c\u01a1 b\u1ea3n v\u00e0 h\u1ecda \u00e2m th\u1ee9 hai do c\u00f9ng m\u1ed9t c\u00e2y \u0111\u00e0n ph\u00e1t ra th\u00ec<\/p>\n

A. t\u1ed1c \u0111\u1ed9 \u00e2m c\u01a1 b\u1ea3n g\u1ea5p \u0111\u00f4i t\u1ed1c \u0111\u1ed9 \u00e2m h\u1ecda th\u1ee9 hai.<\/p>\n

B. t\u1ea7n s\u1ed1 h\u1ecda \u00e2m th\u1ee9 hai g\u1ea5p \u0111\u00f4i t\u1ea7n s\u1ed1 \u00e2m c\u01a1 b\u1ea3n.<\/p>\n

C. t\u1ea7n s\u1ed1 h\u1ecda \u00e2m th\u1ee9 hai b\u1eb1ng n\u1eeda t\u1ea7n s\u1ed1 \u00e2m c\u01a1 b\u1ea3n.<\/p>\n

D. h\u1ecda \u00e2m th\u1ee9 hai c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn h\u01a1n c\u01b0\u1eddng \u0111\u1ed9 \u00e2m c\u01a1 b\u1ea3n.<\/p>\n

C\u00e2u 4:<\/b>\u00a0Trong bu\u1ed5i h\u00f2a nh\u1ea1c \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c \u1edf Nh\u00e0 h\u00e1t l\u1edbn H\u00e0 N\u1ed9i nh\u00e2n d\u1ecbp k\u1ec9 ni\u1ec7m 1000 n\u0103m Th\u0103ng Long \u2013 H\u00e0 N\u1ed9i, m\u1ed9t ng\u01b0\u1eddi ng\u1ed3i d\u01b0\u1edbi kh\u00e1n \u0111\u00e0i nghe \u0111\u01b0\u1ee3c \u00e2m do m\u1ed9t chi\u1ebfc \u0111\u00e0n ph\u00e1t ra c\u00f3 m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m 68 dB, Khi d\u00e0n nh\u1ea1c giao h\u01b0\u1edfng g\u1ed3m nhi\u1ec1u ng\u01b0\u1eddi ch\u01a1i \u0111\u00e0n gi\u1ed1ng \u0111\u00e0n n\u00f3i tr\u00ean th\u1ef1c hi\u1ec7n b\u1ea3n h\u1ee3p x\u01b0\u1edbng, ng\u01b0\u1eddi \u0111\u00f3 c\u1ea3m nh\u1eadn \u0111\u01b0\u1ee3c \u00e2m l\u00e0 80 dB. D\u00e0n nh\u1ea1c giao h\u01b0\u1edfng \u0111\u00f3 c\u00f3 s\u1ed1 ng\u01b0\u1eddi ch\u01a1i l\u00e0<\/p>\n

A. 8 ng\u01b0\u1eddi \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 12 ng\u01b0\u1eddi \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 16 ng\u01b0\u1eddi \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 18 ng\u01b0\u1eddi.<\/p>\n

C\u00e2u 5:<\/b>\u00a0M\u1ed9t d\u00e2y \u0111\u00e0n ghi ta c\u00f3 chi\u1ec1u d\u00e0i 40 cm, \u1edf m\u1ed9t \u0111\u1ed9 c\u0103ng x\u00e1c \u0111\u1ecbnh th\u00ec t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng tr\u00ean d\u00e2y l\u00e0 800 m\/s. M\u1ed9t th\u00ednh gi\u1ea3 c\u00f3 kh\u1ea3 n\u0103ng nghe \u0111\u01b0\u1ee3c \u00e2m c\u00f3 t\u1ea7n s\u1ed1 t\u1ed1i \u0111a l\u00e0 14500 Hz. T\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 340 m\/s. T\u1ea7n s\u1ed1 c\u1ee7a \u00e2m cao nh\u1ea5t m\u00e0 ng\u01b0\u1eddi \u0111\u00f3 c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c t\u1eeb d\u00e2y \u0111\u00e0n<\/p>\n

A. 145000 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. 14000 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0C. 19000 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0D. 12000 Hz.<\/p>\n

C\u00e2u 6:<\/b>\u00a0X\u00e9t ba \u00e2m l\u1ea7n l\u01b0\u1ee3t l\u00e0 f1<\/sub>\u00a0= 50 Hz, f2<\/sub>\u00a0= 10000 Hz v\u00e0 f3<\/sub>\u00a0= 20000 Hz. Khi c\u01b0\u1eddng \u0111\u1ed9 \u00e2m c\u1ee7a ch\u00fang \u0111\u1ec1u l\u00ean t\u1edbi 10 W\/m2<\/sup>th\u00ec nh\u1eefng \u00e2m g\u00e2y cho tai ng\u01b0\u1eddi c\u1ea3m gi\u00e1c \u0111au \u0111\u1edbn v\u00e0 nh\u1ee9c nh\u1ed1i c\u00f3 t\u1ea7n s\u1ed1 l\u00e0<\/p>\n

A. f1<\/sub>,f2<\/sub>,f3<\/sub> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0B. f1<\/sub>,f2<\/sub> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. f2<\/sub>,f3<\/sub>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. f1<\/sub>,f3<\/sub><\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n\n\n\n\n
C\u00e2u<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n5<\/td>\n6<\/td>\n<\/tr>\n
\u0110\u00e1p \u00e1n<\/td>\nD<\/td>\nB<\/td>\nB<\/td>\nC<\/td>\nB<\/td>\nA<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n
<\/div>\n<\/div>\n

C\u00e2u 2:<\/b>\u00a0B<\/p>\n

\"\"<\/p>\n

C\u00e2u 4:<\/b><\/p>\n

\"\"<\/p>\n

C\u00e2u 5:<\/b><\/p>\n

\"\"<\/p>\n

C\u00e2u 6:<\/b><\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2u 1:\u00a0Khi mu\u1ed1n n\u00f3i v\u1ec1 s\u00f3ng \u00e2m, ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai? A. \u1ede c\u00f9ng m\u1ed9t nhi\u1ec7t \u0111\u1ed9, t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed nh\u1ecf h\u01a1n t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng \u00e2m trong n\u01b0\u1edbc. B. S\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 s\u00f3ng d\u1ecdc. C. S\u00f3ng \u00e2m truy\u1ec1n \u0111\u01b0\u1ee3c trong c\u00e1c m\u00f4i tr\u01b0\u1eddng […]<\/p>\n","protected":false},"author":3,"featured_media":26271,"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":"\nB\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: \u0110\u1eb7c tr\u01b0ng v\u1eadt l\u00ed c\u1ee7a \u00e2m (ph\u1ea7n 1)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-dac-trung-vat-li-cua-am-phan-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: \u0110\u1eb7c tr\u01b0ng v\u1eadt l\u00ed c\u1ee7a \u00e2m (ph\u1ea7n 1)\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 1:\u00a0Khi mu\u1ed1n n\u00f3i v\u1ec1 s\u00f3ng \u00e2m, ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 sai? 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A. \u1ede c\u00f9ng m\u1ed9t nhi\u1ec7t \u0111\u1ed9, t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed nh\u1ecf h\u01a1n t\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng \u00e2m trong n\u01b0\u1edbc. B. S\u00f3ng \u00e2m trong kh\u00f4ng kh\u00ed l\u00e0 s\u00f3ng d\u1ecdc. C. 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