2<\/sup>. B\u00e1n k\u00ednh \u0111\u00e1y c\u1ee7a h\u00ecnh n\u00f3n ti\u1ebfp x\u00fac v\u1edbi m\u1eb7t \u0111\u1ea5t \u0111\u01b0\u1ee3c v\u1ec7 tinh ph\u1ee7 s\u00f3ng l\u00e0<\/p>\nA. 1000 km<\/p>\n
B. 500 km<\/p>\n
C. 10000 km<\/p>\n
D. 5000 km<\/p>\n
C\u00e2u 5:<\/b>\u00a0S\u00f3ng \u0111i\u1ec7n t\u1eeb c\u00f3 t\u1ea7n s\u1ed1 f = 300 MHz thu\u1ed9c lo\u1ea1i<\/p>\n
A. s\u00f3ng d\u00e0i<\/p>\n
B. s\u00f3ng trung<\/p>\n
C. s\u00f3ng ng\u1eafn<\/p>\n
D. s\u00f3ng c\u1ef1c ng\u1eafn<\/p>\n
C\u00e2u 6:<\/b>\u00a0Nguy\u00ean t\u1eafc ph\u00e1t s\u00f3ng \u0111i\u1ec7n t\u1eeb l\u00e0<\/p>\n
A. d\u00f9ng m\u1ea1ch dao \u0111\u1ed9ng LC dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a<\/p>\n
B. \u0111\u1eb7t ngu\u1ed3n xoay chi\u1ec1u v\u00e0o hai \u0111\u1ea7u m\u1ea1ch LC<\/p>\n
C. k\u1ebft h\u1ee3p m\u1ea1ch ch\u1ecdn s\u00f3ng LC v\u1edbi anten<\/p>\n
D. k\u1ebft h\u1ee3p m\u00e1y ph\u00e1t dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb duy tr\u00f9 v\u1edbi anten.<\/p>\n
C\u00e2u 7:<\/b>\u00a0K\u00ed hi\u1ec7u c\u00e1c lo\u1ea1i s\u00f3ng \u0111i\u1ec7n t\u1eeb nh\u01b0 sau: (1) s\u00f3ng d\u00e0i ; (2) s\u00f3ng trung ; (3) s\u00f3ng ng\u1eafn ; (4) s\u00f3ng c\u1ef1c ng\u1eafn. Nh\u1eefng s\u00f3ng \u0111i\u1ec7n t\u1eeb n\u00e0o k\u1ec3 tr\u00ean \u0111\u1ec1u b\u1ecb t\u1ea7ng \u0111i\u1ec7n li ph\u1ea3n x\u1ea1 v\u1edbi m\u1ee9c \u0111\u1ed9 kh\u00e1c nhau?<\/p>\n
A. Ch\u1ec9 (10<\/p>\n
B. (2) v\u00e0 (3)<\/p>\n
C. (3) v\u00e0 (4)<\/p>\n
D. (1), (2) v\u00e0 (3)<\/p>\n
C\u00e2u 8:<\/b>\u00a0\u0110\u1ec3 truy\u1ec1n c\u00e1c t\u00edn hi\u1ec7u truy\u1ec1n h\u00ecnh v\u00f4 tuy\u1ebfn, ng\u01b0\u1eddi ta th\u01b0\u1eddng d\u00f9ng c\u00e1c s\u00f3ng \u0111i\u1ec7n t\u1eeb c\u00f3 b\u01b0\u1edbc s\u00f3ng v\u00e0o kho\u1ea3ng<\/p>\n
A. 1 km \u0111\u1ebfn 3 km<\/p>\n
B. v\u00e0i tr\u0103m m\u00e9t<\/p>\n
C. 50 m tr\u1edf l\u00ean<\/p>\n
D. d\u01b0\u1edbi 10 m<\/p>\n
H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0111\u00e1p \u00e1n<\/b><\/p>\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 | 8<\/td>\n<\/tr>\n |
\n| \u0110\u00e1p \u00e1n<\/td>\n | D<\/td>\n | B<\/td>\n | C<\/td>\n | A<\/td>\n | D<\/td>\n | D<\/td>\n | D<\/td>\n | D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n C\u00e2u 4:<\/b>\u00a0A<\/p>\n ![\"B\u00e0i](\"http:\/\/vietjack.com\/bai-tap-trac-nghiem-vat-li-12\/images\/song-dien-tu-cau-4.PNG\") <\/p>\n","protected":false},"excerpt":{"rendered":"
C\u00e2u 1:\u00a0Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang khi n\u00f3i v\u1ec1 s\u00f3ng \u0111i\u1ec7n t\u1eeb? A. \u0110i\u1ec7n t\u00edch dao \u0111\u1ed9ng kh\u00f4ng th\u1ec3 b\u1ee9c x\u1ea1 s\u00f3ng \u0111i\u1ec7n t\u1eeb. B. T\u1ed1c \u0111\u1ed9 c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eeb trong ch\u00e2n kh\u00f4ng nh\u1ecf h\u01a1n nhi\u1ec1u l\u1ea7n so v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ee7a \u00e1nh s\u00e1ng trong ch\u00e2n kh\u00f4ng. C. T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng […]<\/p>\n","protected":false},"author":3,"featured_media":25883,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[158],"tags":[1443,1442],"yoast_head":"\n B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12 S\u00f3ng \u0111i\u1ec7n t\u1eeb<\/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-song-dien-tu\/\" \/>\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 S\u00f3ng \u0111i\u1ec7n t\u1eeb\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 1:\u00a0Ph\u00e1t bi\u1ec3u n\u00e0o sau \u0111\u00e2y l\u00e0 \u0111\u00fang khi n\u00f3i v\u1ec1 s\u00f3ng \u0111i\u1ec7n t\u1eeb? A. \u0110i\u1ec7n t\u00edch dao \u0111\u1ed9ng kh\u00f4ng th\u1ec3 b\u1ee9c x\u1ea1 s\u00f3ng \u0111i\u1ec7n t\u1eeb. B. T\u1ed1c \u0111\u1ed9 c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eeb trong ch\u00e2n kh\u00f4ng nh\u1ecf h\u01a1n nhi\u1ec1u l\u1ea7n so v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ee7a \u00e1nh s\u00e1ng trong ch\u00e2n kh\u00f4ng. C. 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A. \u0110i\u1ec7n t\u00edch dao \u0111\u1ed9ng kh\u00f4ng th\u1ec3 b\u1ee9c x\u1ea1 s\u00f3ng \u0111i\u1ec7n t\u1eeb. B. T\u1ed1c \u0111\u1ed9 c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eeb trong ch\u00e2n kh\u00f4ng nh\u1ecf h\u01a1n nhi\u1ec1u l\u1ea7n so v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ee7a \u00e1nh s\u00e1ng trong ch\u00e2n kh\u00f4ng. C. T\u1ea7n s\u1ed1 c\u1ee7a s\u00f3ng […]","og_url":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-song-dien-tu\/","og_site_name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam","article_published_time":"2018-04-09T10:26:24+00:00","og_image":[{"width":390,"height":64,"url":"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/song-dien-tu-cau-4.png","type":"image\/png"}],"author":"H\u00e0 Trang","twitter_card":"summary_large_image","twitter_misc":{"Written by":"H\u00e0 Trang","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-song-dien-tu\/","url":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-song-dien-tu\/","name":"B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m V\u1eadt L\u00ed 12 S\u00f3ng \u0111i\u1ec7n t\u1eeb","isPartOf":{"@id":"https:\/\/lop12.edu.vn\/#website"},"datePublished":"2018-04-09T10:26:24+00:00","dateModified":"2018-04-09T10:26:24+00:00","author":{"@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45"},"breadcrumb":{"@id":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-song-dien-tu\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-song-dien-tu\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lop12.edu.vn\/bai-tap-trac-nghiem-vat-li-12-song-dien-tu\/#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 S\u00f3ng \u0111i\u1ec7n t\u1eeb"}]},{"@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\/"}]}},"_links":{"self":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/25882"}],"collection":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/comments?post=25882"}],"version-history":[{"count":1,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/25882\/revisions"}],"predecessor-version":[{"id":25884,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/25882\/revisions\/25884"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media\/25883"}],"wp:attachment":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media?parent=25882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/categories?post=25882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/tags?post=25882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} |