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{"id":26243,"date":"2018-04-10T16:34:54","date_gmt":"2018-04-10T09:34:54","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=26243"},"modified":"2018-04-10T16:34:54","modified_gmt":"2018-04-10T09:34:54","slug":"bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/","title":{"rendered":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)"},"content":{"rendered":"

C\u00e2u 8:<\/b>\u00a0M\u1ed9t ngu\u1ed3n \u00e2m \u0111\u01b0\u1ee3c d\u00ecm trong n\u01b0\u1edbc c\u00f3 t\u1ea7n s\u1ed1 f = 375 Hz. Hai \u0111i\u1ec3m g\u1ea7n nhau nh\u1ea5t tr\u00ean ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng c\u00e1ch nhau d = 50 cm lu\u00f4n lu\u00f4n l\u1ec7ch pha v\u1edbi nhau \u03c0\/4. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng l\u00e0<\/p>\n

A. 400 m\/s\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 800 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 1500 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 2000 m\/s.<\/p>\n

C\u00e2u 9:<\/b>\u00a0M\u1ed9t d\u00e2y \u0111\u00e0n d\u00e0i 40 cm. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng tr\u00ean d\u00e2y l\u00e0 50 m\/s. T\u1ea7n s\u1ed1 c\u1ee7a \u00e2m c\u01a1 b\u1ea3n m\u00e0 d\u00e2y \u0111\u00e0n dao \u0111\u1ed9ng ph\u00e1t ra l\u00e0<\/p>\n

A. 31, 25 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 62,5 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 125 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 130 Hz.<\/p>\n

C\u00e2u 10:<\/b>\u00a0M\u1ed9t d\u00e2y \u0111\u00e0n h\u1ed3i r\u1ea5t d\u00e0i c\u00f3 \u0111\u1ea7u A dao \u0111\u1ed9ng theo ph\u01b0\u01a1ng vu\u00f4ng g\u00f3c v\u1edbi s\u1ee3i d\u00e2y. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng tr\u00ean d\u00e2y l\u00e0 4m\/s. Xet m\u1ed9t \u0111i\u1ec3m M tr\u00ean d\u00e2y v\u00e0 c\u00e1ch A m\u1ed9t \u0111o\u1ea1n 40 cm, ng\u01b0\u1eddi ta th\u1ea5y M lu\u00f4n lu\u00f4n dao \u0111\u1ed9ng l\u1ec7ch pha so v\u1edbi A m\u1ed9t g\u00f3c \u0394\u03c6 =(k+0,5)\u03c0 v\u1edbi k l\u00e0 s\u1ed1 nguy\u00ean. BI\u1ebft t\u1ea7n s\u1ed1 f c\u00f3 gi\u00e1 tr\u1ecb trong kho\u1ea3ng t\u1eeb 8 Hz \u0111\u1ebfn 13 Hz. T\u1ea7n s\u1ed1 dao \u0111\u1ed9ng b\u1eb1ng<\/p>\n

A. 10 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 12,5 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 12 Hz \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 8,5 Hz<\/p>\n

C\u00e2u 11:<\/b>\u00a0M\u1ed9t \u00e2m thoa c\u00f3 t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng ri\u00eang 850 Hz \u0111\u01b0\u1ee3c \u0111\u1eb7t s\u00e1t mi\u1ec7ng m\u1ed9t \u1ed1ng nghi\u1ec7m h\u00ecnh tr\u1ee5 \u0111\u00e1y k\u00edn \u0111\u1eb7t th\u1eb3ng \u0111\u1ee9ng, cao 80 cm. \u0110\u1ed5 d\u1ea7n n\u01b0\u1edbc v\u00e0o \u1ed1ng nghi\u1ec7m \u0111\u1ebfn \u0111\u1ed9 cao 30 cm th\u00ec th\u1ea5y \u00e2m \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i l\u00ean r\u1ea5t m\u1ea1nh. Bi\u1ebft t\u1ed1c \u0111\u1ed9 truy\u1ec1n \u00e2m trong kh\u00f4ng kh\u00ed c\u00f3 gi\u00e1 tr\u1ecb n\u1eb1m trong kho\u1ea3ng t\u1eeb 300 m\/s \u0111\u1ebfn 350 m\/s. Khi ti\u1ebfp t\u1ee5c \u0111\u1ed5 t\u1eeb t\u1eeb n\u01b0\u1edbc th\u00eam v\u00e0o \u1ed1ng nghi\u1ec7m cho \u0111\u1ebfn \u0111\u1ea7y th\u00ec s\u1ed1 v\u1ecb tr\u00ed c\u1ee7a m\u1ef1c n\u01b0\u1edbc cho \u00e2m \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i m\u1ea1nh nh\u1ea5t l\u00e0<\/p>\n

A. 3 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B.1 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 2 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 4.<\/p>\n

C\u00e2u 12:<\/b>\u00a0M\u1ed9t ngu\u1ed3n ph\u00e1t s\u00f3ng \u00e2m \u0111\u1eb3ng h\u01b0\u1edbng, \u0111\u01b0\u1ee3c coi l\u00e0 ngu\u1ed3n \u0111i\u1ec3m. T\u1ea1i \u0111i\u1ec3m A c\u00e1ch ngu\u1ed3n 1 m, m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m l\u00e0 70 dB. Bi\u1ebft c\u01b0\u1eddng \u0111\u1ed9 \u00e2m chu\u1ea9n l\u00e0 10-12\u00a0<\/sup>W\/m2<\/sup>\u00a0v\u00e0 gi\u1ea3 thi\u1ebft m\u00f4i tr\u01b0\u1eddng kh\u00f4ng h\u1ea5p th\u1ee5 \u00e2m. C\u01b0\u1eddng \u0111\u1ed9 \u00e2m t\u1ea1i \u0111i\u1ec3m B c\u00e1ch ngu\u1ed3n 10 m l\u00e0<\/p>\n

A. 10-5<\/sup>\u00a0W\/m2<\/sup> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 10-7<\/sup>W\/m2<\/sup><\/p>\n

C. 10-8<\/sup>W\/m2<\/sup>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 10-10<\/sup>W\/m2<\/sup>.<\/p>\n

C\u00e2u 13:<\/b>\u00a0M\u1ed9t ngu\u1ed3n \u00e2m \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf mi\u1ec7ng m\u1ed9t \u1ed1ng h\u00ecnh tr\u1ee5 th\u1eb3ng \u0111\u1ee9ng ch\u1ee9a \u0111\u1ea7y n\u01b0\u1edbc, m\u1ed1c t\u00ednh chi\u1ec1u s\u00e2u n\u01b0\u1edbc b\u1eb1ng 0 \u1edf mi\u1ec7ng \u1ed1ng. H\u1ea1 d\u1ea7n m\u1ef1c n\u01b0\u1edbc th\u00ec th\u1ea5y khi chi\u1ec1u s\u00e2u c\u1ee7a n\u01b0\u1edbc trong \u1ed1ng nh\u1eadn c\u00e1c gi\u00e1 tr\u1ecb L1<\/sub>,L2<\/sub>,L3<\/sub>,L4<\/sub>,L5<\/sub>\u00a0th\u00ec nghe \u0111\u01b0\u1ee3c \u00e2m to nh\u1ea5t. T\u1ec9 s\u1ed1 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y \u0111\u00fang?<\/p>\n

\"\"<\/p>\n

C\u00e2u 14:<\/b>\u00a0M\u1ed9t ngu\u1ed3n \u00e2m l\u00e0 ngu\u1ed3n \u0111i\u1ec3m ph\u00e1t \u00e2m \u0111\u1eb3ng h\u01b0\u1edbng trong kh\u00f4ng gian. Gi\u1ea3 s\u1eed kh\u00f4ng c\u00f3 s\u1ef1 h\u1ea5p th\u1ee5 v\u00e0 ph\u1ea3n x\u1ea1 \u00e2m. T\u1ea1i m\u1ed9t \u0111i\u1ec3m c\u00e1ch ngu\u1ed3n \u00e2m 10 m th\u00ec m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m l\u00e0 80 dB. T\u1ea1i \u0111i\u1ec3m c\u00e1ch ngu\u1ed3n \u00e2m 1 m th\u00ec m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m b\u1eb1ng<\/p>\n

A. 90 dB \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 100 dB \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 110 dB \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 120 dB.<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\n\n\n\n\n
C\u00e2u<\/td>\n8<\/td>\n9<\/td>\n10<\/td>\n11<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n<\/tr>\n
\u0110\u00e1p \u00e1n<\/td>\nC<\/td>\nB<\/td>\nB<\/td>\nC<\/td>\nB<\/td>\nC<\/td>\nB<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e2u 8:<\/b>\u00a0C<\/p>\n

\"\"<\/p>\n

C\u00e2u 9:<\/b>\u00a0B<\/p>\n

\u00c2m c\u01a1 b\u1ea3n c\u00f3 b\u01b0\u1edbc s\u00f3ng \u03bb = 2l = 0,8 m, \u1ee9ng v\u1edbi t\u1ea7n s\u1ed1 f=v\/\u03bb=62,5 Hz<\/p>\n

C\u00e2u 10:<\/b>\u00a0B<\/p>\n

\"\"<\/p>\n

C\u00e2u 11:<\/b>\u00a0C<\/p>\n

L = 80 cm ; m\u1ed9t \u0111\u1ea7u l\u00e0 n\u00fat, m\u1ed9t \u0111\u1ea7u l\u00e0 b\u1ee5ng s\u00f3ng<\/p>\n

\u0110\u1ed5 n\u01b0\u1edbc \u0111\u1ebfn h = 80 \u2013 30 = 50 cm th\u00ec \u0111\u1ea7u h\u1edf th\u00e0nh b\u1ee5ng s\u00f3ng (\u00e2m m\u1ea1nh)<\/p>\n

\"\"<\/p>\n

C\u00e2u 12:<\/b>\u00a0B<\/p>\n

V\u00ec m\u00f4i tr\u01b0\u1eddng kh\u00f4ng h\u1ea5p th\u1ee5 \u00e2m, c\u01b0\u1eddng \u0111\u1ed9 \u00e2m t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi kho\u1ea3ng c\u00e1ch \u0111\u1ebfn ngu\u1ed3n \u00e2m:<\/p>\n

\"\"<\/p>\n

C\u00e2u 13:<\/b>\u00a0C<\/p>\n

M\u1eb7t n\u01b0\u1edbc l\u00e0 n\u00fat s\u00f3ng, mi\u1ec7ng \u1ed1ng l\u00e0 b\u1ee5ng s\u00f3ng n\u00ean<\/p>\n

\"\"<\/p>\n

C\u00e2u 14:<\/b>\u00a0B<\/p>\n

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

C\u00e2u 8:\u00a0M\u1ed9t ngu\u1ed3n \u00e2m \u0111\u01b0\u1ee3c d\u00ecm trong n\u01b0\u1edbc c\u00f3 t\u1ea7n s\u1ed1 f = 375 Hz. Hai \u0111i\u1ec3m g\u1ea7n nhau nh\u1ea5t tr\u00ean ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng c\u00e1ch nhau d = 50 cm lu\u00f4n lu\u00f4n l\u1ec7ch pha v\u1edbi nhau \u03c0\/4. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng l\u00e0 A. 400 m\/s\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 800 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 1500 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 2000 […]<\/p>\n","protected":false},"author":3,"featured_media":26244,"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: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)<\/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-chuong-2-phan-2\/\" \/>\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: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 8:\u00a0M\u1ed9t ngu\u1ed3n \u00e2m \u0111\u01b0\u1ee3c d\u00ecm trong n\u01b0\u1edbc c\u00f3 t\u1ea7n s\u1ed1 f = 375 Hz. Hai \u0111i\u1ec3m g\u1ea7n nhau nh\u1ea5t tr\u00ean ph\u01b0\u01a1ng truy\u1ec1n s\u00f3ng c\u00e1ch nhau d = 50 cm lu\u00f4n lu\u00f4n l\u1ec7ch pha v\u1edbi nhau \u03c0\/4. T\u1ed1c \u0111\u1ed9 truy\u1ec1n s\u00f3ng l\u00e0 A. 400 m\/s\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B. 800 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 C. 1500 m\/s \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D. 2000 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2018-04-10T09:34:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-149.png\" \/>\n\t<meta property=\"og:image:width\" content=\"273\" \/>\n\t<meta property=\"og:image:height\" content=\"113\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"H\u00e0 Trang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"H\u00e0 Trang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/\",\"url\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/\",\"name\":\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-10T09:34:54+00:00\",\"dateModified\":\"2018-04-10T09:34:54+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\",\"name\":\"H\u00e0 Trang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"caption\":\"H\u00e0 Trang\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/trangvth2\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-chuong-2-phan-2\/","og_locale":"en_US","og_type":"article","og_title":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12: Ch\u01b0\u01a1ng 2 (ph\u1ea7n 2)","og_description":"C\u00e2u 8:\u00a0M\u1ed9t ngu\u1ed3n \u00e2m \u0111\u01b0\u1ee3c d\u00ecm trong n\u01b0\u1edbc c\u00f3 t\u1ea7n s\u1ed1 f = 375 Hz. 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