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{"id":8313,"date":"2017-02-10T03:48:53","date_gmt":"2017-02-10T03:48:53","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=8313"},"modified":"2017-02-10T03:48:53","modified_gmt":"2017-02-10T03:48:53","slug":"de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/","title":{"rendered":"\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd – \u0110\u1ec1 s\u1ed1 1"},"content":{"rendered":"

\"de<\/p>\n

C\u00e2u 12: Th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m giao thoa s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u1edbi 2 ngu\u1ed3n k\u1ebft h\u1ee3p A v\u00e0 B c\u00e1ch nhau 15 (cm) dao \u0111\u1ed9ng c\u00f9ng t\u1ea7n s\u1ed1 f = 30 (Hz) , c\u00f9ng pha. V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v = 60 (cm\/s). X\u00e9t c\u00e1c \u0111i\u1ec3m tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u00e0 thu\u1ed9c \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi AB t\u1ea1i A, \u0111i\u1ec3m m\u00e0 ph\u1ea7n t\u1eed t\u1ea1i \u0111\u00f3 kh\u00f4ng dao \u0111\u1ed9ng c\u00e1ch A m\u1ed9t \u0111o\u1ea1n xa nh\u1ea5t b\u1eb1ng.<\/p>\n

a. 112 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. 150 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 c. 124 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. 160 (cm)<\/p>\n

C\u00e2u 13: Chi\u1ebfu m\u00f4t ch\u00f9m tia h\u1eb9p \u00e1nh s\u00e1ng tr\u1eafng t\u1eeb n\u01b0\u1edbc ra ngo\u00e0i kh\u00f4ng kh\u00ed. Ta th\u1ea5y tia s\u00e1ng m\u00e0u l\u1ee5c n\u1eb1m l\u00e0 l\u00e0 theo m\u1eb7t n\u01b0\u1edbc (s\u00e1t m\u1eb7t n\u01b0\u1edbc). Kh\u00f4ng k\u1ec3 tia l\u1ee5c, tia l\u00f3 ra ngo\u00e0i kh\u00f4ng kh\u00ed l\u00e0 tia:<\/p>\n

a. lam, ch\u00e0m, t\u00edm\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. ch\u00e0m, v\u00e0ng, \u0111\u1ecf<\/p>\n

c. \u0111\u1ecf, v\u00e0ng, cam\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. t\u00edm, v\u00e0ng, cam<\/p>\n

\"de<\/p>\n

C\u00e2u 21: D\u00f9ng m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n kh\u00f4ng \u0111\u1ed5i c\u00f3 su\u1ea5t \u0111i\u1ec7n \u0111\u1ed9ng E = 8 (V) n\u1ea1p \u0111i\u1ec7n cho 1 b\u1ed9 t\u1ee5 \u0111i\u1ec7n C1 v\u00e0 C2 = 3C1 m\u1eafc n\u1ed1i ti\u1ebfp. Sau \u0111\u00f3 ng\u1eaft b\u1ed9 t\u1ee5 ra kh\u1ecfi ngu\u1ed3n, r\u1ed3i m\u1eafc 2 \u0111\u1ea7u b\u1ed9 t\u1ee5 v\u00e0o 1 cu\u1ed9n thu\u1ea7n c\u1ea3m L th\u00ec trong m\u1ea1ch c\u00f3 dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb t\u1ef1 do. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u0103ng l\u01b0\u1ee3ng t\u1eeb tr\u01b0\u1eddng trong cu\u1ed9n c\u1ea3m b\u1eb1ng 0.75 l\u1ea7n n\u0103ng l\u01b0\u1ee3ng c\u1ee7a m\u1ea1ch dao \u0111\u1ed9ng th\u00ec ta n\u1ed1i t\u1eaft t\u1ee5 C1. Hi\u1ec7u \u0111i\u1ec7n th\u1ebf c\u1ef1c \u0111\u1ea1i tr\u00ean t\u1ee5 C2 sau \u0111\u00f3 l\u00e0:<\/p>\n

a. (V)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. 3.606 (V)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 c. 6 (V)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. 10,818 (V)<\/p>\n

C\u00e2u 22: M\u1ed9t con l\u1eafc l\u00f2 xo \u0111\u1eb7t tr\u00ean m\u1eb7t ph\u1eb3ng n\u1eb1m ngang. K\u00e9o v\u1eadt nh\u1ecf theo chi\u1ec1u d\u00e3n c\u1ee7a l\u00f2 xo \u0111\u1ebfn khi c\u00e1ch v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng 1 \u0111o\u1ea1n 9 (cm) th\u00ec bu\u00f4ng nh\u1eb9 cho dao \u0111\u1ed9ng \u0111i\u1ec1u ho\u00e0. T\u1ea1i th\u1eddi \u0111i\u1ec3m v\u1eadt qua li \u0111\u1ed9 3 (cm) theo chi\u1ec1u d\u00e3n c\u1ee7a l\u00f2 xo th\u00ec ta gi\u1eef ch\u1eb7t l\u00f2 xo t\u1ea1i v\u1ecb tr\u00ed c\u00e1ch gi\u00e1 c\u1ed1 \u0111\u1ecbnh 1 \u0111o\u1ea1n b\u1eb1ng 2\/3 chi\u1ec1u d\u00e0i t\u1ef1 nhi\u00ean c\u1ee7a l\u00f2 xo. Sau \u0111\u00f3 v\u1eadt s\u1ebd ti\u1ebfp t\u1ee5c dao \u0111\u1ed9ng \u0111i\u1ec1u ho\u00e0 v\u1edbi bin \u0111\u1ed9<\/p>\n

a. 9 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. 3 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 c. 6 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. 5 (cm)<\/p>\n

\"dE<\/p>\n

C\u00e2u 32: Th\u1ef1c hi\u1ec7n s\u00f3ng d\u1eebng tr\u00ean d\u00e2y v\u1edbi 1 \u0111\u1ea7u c\u1ed1 \u0111\u1ecbnh v\u00e0 1 \u0111\u1ea7u t\u1ef1 do. Khi t\u1ea7n s\u1ed1 s\u00f3ng l\u00e0 f th\u00ec tr\u00ean d\u00e2y c\u00f3 9 b\u1ee5ng s\u00f3ng. N\u1ebfu t\u1ea7n s\u1ed1 s\u00f3ng t\u0103ng g\u1ea5p 3 l\u1ea7n th\u00ec s\u1ed1 n\u00fat s\u00f3ng tr\u00ean d\u00e2y l\u00e0:<\/p>\n

a. 18\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. 20\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 c. 26\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. 25<\/p>\n

C\u00e2u 33: M\u1ed9t tr\u1ea1m ph\u00e1t \u0111i\u1ec7n cung c\u1ea5p \u0111i\u1ec7n n\u0103ng cho m\u1ed9t khu d\u00e2n c\u01b0 b\u1eb1ng 1 \u0111\u01b0\u1eddng d\u00e2y d\u1eabn. Khi \u0111i\u1ec7n \u00e1p \u1edf tr\u1ea1m ph\u00e1t t\u0103ng t\u1eeb U l\u00ean 3U th\u00ec s\u1ed1 h\u1ed9 d\u00e2n \u0111\u01b0\u1ee3c cung c\u1ea5p \u0111\u1ee7 \u0111i\u00ean n\u0103ng t\u0103ng t\u1eeb 100 h\u1ed9 l\u00ean 260 h\u1ed9, gi\u1ea3 s\u1eed c\u00f4ng su\u1ea5t ti\u00eau th\u1ee5 \u1edf c\u00e1c h\u1ed9 nh\u01b0 nhau. N\u1ebfu \u0111i\u1ec7n \u00e1p \u1edf tr\u1ea1m ph\u00e1t l\u00e0 6U th\u00ec s\u1ed1 h\u1ed9 d\u00e2n \u0111\u01b0\u1ee3c cung c\u1ea5p \u0111\u1ee7 \u0111i\u1ec7n n\u0103ng l\u00e0:<\/p>\n

a. 520\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. 360\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 c. 275\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. 280<\/p>\n

C\u00e2u 34: C\u00f3 2 ngu\u1ed3n k\u1ebft h\u1ee3p S1 v\u00e0 S2 tr\u00ean m\u1eb7t n\u01b0\u1edbc c\u00e1ch nhau 6(cm) dao \u0111\u1ed9ng c\u00f9ng t\u1ea7n s\u1ed1, c\u00f9ng pha. C\u00e1c g\u1ee3n l\u1ed3i chia \u0111o\u1ea1n S1S2 th\u00e0nh 10 \u0111o\u1ea1n b\u1eb1ng nhau. Kho\u1ea3ng c\u00e1ch ng\u1eafn nh\u1ea5t t\u1eeb trung \u0111i\u1ec3m O c\u1ee7a S1S2 \u0111\u1ebfn c\u00e1c ph\u1ea7n t\u1eed thu\u1ed9c \u0111\u01b0\u1eddng trung tr\u1ef1c c\u1ee7a S1S2 , m\u00e0 t\u1ea1i \u0111\u00f3 dao \u0111\u1ed9ng c\u00f9ng pha v\u1edbi 2 ngu\u1ed3n S1 v\u00e0 S2 l\u00e0:<\/p>\n

a. 1.99 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 b. 2 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 c. 1.95 (cm)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 d. 3 (cm)<\/p>\n

\"dE\"dE<\/p>\n

\u0110\u00e1p \u00e1n \u0111\u1ec1 thi th\u1eed 2017 m\u00f4n v\u1eadt l\u00fd n\u00e0y c<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2u 12: Th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m giao thoa s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u1edbi 2 ngu\u1ed3n k\u1ebft h\u1ee3p A v\u00e0 B c\u00e1ch nhau 15 (cm) dao \u0111\u1ed9ng c\u00f9ng t\u1ea7n s\u1ed1 f = 30 (Hz) , c\u00f9ng pha. V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v = 60 (cm\/s). X\u00e9t c\u00e1c \u0111i\u1ec3m tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u00e0 thu\u1ed9c […]<\/p>\n","protected":false},"author":2,"featured_media":43,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[25],"tags":[],"yoast_head":"\n\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd - \u0110\u1ec1 s\u1ed1 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\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd - \u0110\u1ec1 s\u1ed1 1\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 12: Th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m giao thoa s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u1edbi 2 ngu\u1ed3n k\u1ebft h\u1ee3p A v\u00e0 B c\u00e1ch nhau 15 (cm) dao \u0111\u1ed9ng c\u00f9ng t\u1ea7n s\u1ed1 f = 30 (Hz) , c\u00f9ng pha. V\u1eadn t\u1ed1c truy\u1ec1n s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v = 60 (cm\/s). X\u00e9t c\u00e1c \u0111i\u1ec3m tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u00e0 thu\u1ed9c […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/\" \/>\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=\"2017-02-10T03:48:53+00:00\" \/>\n<meta name=\"author\" content=\"Thu H\u01b0\u01a1ng\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Thu H\u01b0\u01a1ng\" \/>\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\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/\",\"url\":\"https:\/\/lop12.edu.vn\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/\",\"name\":\"\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd - \u0110\u1ec1 s\u1ed1 1\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2017-02-10T03:48:53+00:00\",\"dateModified\":\"2017-02-10T03:48:53+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/a37935c3c859cc908088334047878c87\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd – \u0110\u1ec1 s\u1ed1 1\"}]},{\"@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\/a37935c3c859cc908088334047878c87\",\"name\":\"Thu H\u01b0\u01a1ng\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/5cb73f4a14844c4a42ce9b1decae8026?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/5cb73f4a14844c4a42ce9b1decae8026?s=96&d=mm&r=g\",\"caption\":\"Thu H\u01b0\u01a1ng\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/huongttt2\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd - \u0110\u1ec1 s\u1ed1 1","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\/de-thi-thu-thpt-qg-2017-mon-vat-ly-de-1\/","og_locale":"en_US","og_type":"article","og_title":"\u0110\u1ec1 thi th\u1eed THPT QG 2017 m\u00f4n V\u1eadt l\u00fd - \u0110\u1ec1 s\u1ed1 1","og_description":"C\u00e2u 12: Th\u1ef1c hi\u1ec7n th\u00ed nghi\u1ec7m giao thoa s\u00f3ng tr\u00ean m\u1eb7t n\u01b0\u1edbc v\u1edbi 2 ngu\u1ed3n k\u1ebft h\u1ee3p A v\u00e0 B c\u00e1ch nhau 15 (cm) dao \u0111\u1ed9ng c\u00f9ng t\u1ea7n s\u1ed1 f = 30 (Hz) , c\u00f9ng pha. 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