B\u00e0i 1 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0H\u00e3y n\u00eau b\u1ed1n nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a vi\u1ec7c th\u00f4ng tin li\u00ean l\u1ea1c b\u1eb1ng s\u00f3ng v\u00f4 tuy\u1ebfn.<\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n – \u00a0B\u1ed1n nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n:<\/p>\n – \u00a0D\u00f9ng s\u00f3ng v\u00f4 tuy\u1ebfn c\u00f3 b\u01b0\u1edbc s\u00f3ng ng\u1eafn l\u00e0m s\u00f3ng mang \u0111\u1ec3 t\u1ea3i c\u00e1c th\u00f4ng tin.<\/p>\n – \u00a0Bi\u1ebfn \u0111i\u1ec7u c\u00e1c s\u00f3ng mang.<\/p>\n – \u00a0T\u00e1ch s\u00f3ng \u00e2m t\u1ea7n ra kh\u1ecfi s\u00f3ng cao t\u1ea7n.<\/p>\n – \u00a0Khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u thu \u0111\u01b0\u1ee3c<\/p>\n B\u00e0i 2 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0S\u00f3ng mang l\u00e0 g\u00ec? Th\u1ebf n\u00e0o l\u00e0 bi\u1ebfn \u0111i\u1ec7u m\u1ed9t s\u00f3ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n?<\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n – S\u00f3ng mang l\u00e0 nh\u1eefng s\u00f3ng v\u00f4 tuy\u1ebfn \u00f9ng \u0111\u1ec3 t\u1ea3i c\u00e1c th\u00f4ng tin.<\/p>\n – Bi\u1ebfn \u0111i\u1ec7u m\u1ed9t s\u00f3ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n l\u00e0 d\u00f9ng m\u1ed9t b\u1ed9 ph\u1eadn kh\u00e1c \u0111\u1ec3 “tr\u1ed9n” s\u00f3ng \u00e2m t\u1ea7n v\u1edbi s\u00f3ng mang.<\/p>\n B\u00e0i 3 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0V\u1ebd s\u01a1 \u0111\u1ed3 kh\u1ed1i c\u1ee7a m\u1ed9t m\u00e1y ph\u00e1t thanh \u0111\u01a1n gi\u1ea3n v\u00e0 gi\u1ea3i th\u00edch t\u00e1c d\u1ee5ng c\u1ee7a t\u1eebng b\u1ed9 ph\u00e2n trong s\u01a1 \u0111\u1ed3<\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n S\u01a1 \u0111\u1ed3 kh\u1ed1i c\u1ee7a m\u1ed9t m\u00e1y ph\u00e1t thanh \u0111\u01a1n gi\u1ea3n bi\u1ec3u di\u1ec5n nh\u01b0 h\u00ecnh v\u1ebd. Trong \u0111\u00f3: Micro (1); m\u1ea1ch ph\u00e1t s\u00f3ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n (2); m\u1ea1ch bi\u1ebfn \u0111i\u1ec7u (3); m\u1ea1ch khu\u1ebfch \u0111\u1ea1i (4) v\u00e0 cu\u1ed1i c\u0169ng l\u00e0 anten ph\u00e1t (5)<\/p>\n <\/p>\n T\u00e1c d\u1ee5ng c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn:<\/p>\n – \u00a0 Micro(1): Bi\u1ebfn dao \u0111\u1ed9ng \u00e2m th\u00e0nh dao \u0111\u1ed9ng \u0111i\u1ec7n c\u00f3 c\u00f9ng t\u1ea7n s\u1ed1.<\/p>\n – \u00a0 M\u1ea1ch ph\u00e1t s\u00f3ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n (2): T\u1ea1o ra s\u00f3ng mang c\u00f3 t\u1ea7n s\u1ed1 cao (t\u1eeb 500kHz \u0111\u1ebfn 900MHz)<\/p>\n – \u00a0 M\u1ea1ch bi\u1ebfn \u0111i\u1ec7u (3): “tr\u1ed9n” s\u00f3ng \u00e2m t\u1ea7n v\u1edbi s\u00f3ng mang (bi\u1ebfn \u0111i\u1ec7u)<\/p>\n – \u00a0 M\u1ea1ch khu\u1ebfch \u0111\u1ea1i (4): L\u00e0m cho s\u00f3ng mang c\u00f3 n\u0103ng l\u01b0\u1ee3ng (bi\u00ean \u0111\u1ed9) l\u1edbn h\u01a1n \u0111\u1ec3 n\u00f3 c\u00f3 th\u1ec3 truy\u1ec1n \u0111i xa<\/p>\n – \u00a0 Anten ph\u00e1t (5): B\u1ee9c x\u1ea1 s\u00f3ng \u0111i\u1ec7n t\u1eeb ra kh\u00f4ng gian<\/p>\n B\u00e0i 4 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0V\u1ebd s\u01a1 \u0111\u1ed3 kh\u1ed1i c\u1ee7a m\u1ed9t m\u00e1y thu thanh \u0111\u01a1n gi\u1ea3n v\u00e0 gi\u1ea3i th\u00edch t\u00e1c d\u1ee5ng c\u1ee7a t\u1eebng b\u1ed9 ph\u1eadn trong s\u01a1 \u0111\u1ed3<\/span><\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n S\u01a1 \u0111\u1ed3 kh\u1ed1i c\u1ee7a m\u1ed9t m\u00e1y thu thanh \u0111\u01a1n gi\u1ea3n, v\u1ebd nh\u01b0 h\u00ecnh sau. Trong \u0111\u00f3: Anten thu (1); m\u1ea1ch khu\u1ebfch \u0111\u1ea1i dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n (2); m\u1ea1ch t\u00e1ch s\u00f3ng (3); m\u1ea1ch khu\u1ebfch \u0111\u1ea1i dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb \u00e2m t\u1ea7n (4) v\u00e0 loa (5)<\/p>\n <\/p>\n T\u00e1c d\u1ee5ng c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn:<\/p>\n – \u00a0 Anten thu (1): C\u00f3 th\u1ec3 thu \u0111\u01b0\u1ee3c t\u1ea5t c\u1ea3 c\u00e1c s\u00f3ng \u0111i\u1ec7n t\u1eeb truy\u1ec1n t\u1edbi n\u00f3<\/p>\n – \u00a0 M\u1ea1ch khu\u1ebfch \u0111\u1ea1i dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n (2): L\u00e0m cho s\u00f3ng \u0111i\u1ec7n t\u1eeb cao t\u1ea7n thu \u0111\u01b0\u1ee3c c\u00f3 n\u0103ng l\u01b0\u1ee3ng (bi\u00ean \u0111\u1ed9) l\u1edbn h\u01a1n<\/p>\n – \u00a0 M\u1ea1ch t\u00e1ch s\u00f3ng (3): T\u00e1ch s\u00f3ng \u00e2m t\u1ea7n ra kh\u1ecfi s\u00f3ng mang.<\/p>\n – \u00a0 M\u1ea1ch khu\u1ebfch \u0111\u1ea1i dao \u0111\u1ed9ng \u0111i\u1ec7n t\u1eeb \u00e2m t\u1ea7n (4): L\u00e0m cho dao \u0111\u1ed9ng \u00e2m t\u1ea7n v\u1eeba t\u00e1ch ra c\u00f3 n\u0103ng l\u01b0\u1ee3ng (bi\u00ean \u0111\u1ed9) l\u1edbn h\u01a1n<\/p>\n – \u00a0 Loa (5): Bi\u1ebfn dao \u0111\u1ed9ng \u0111i\u1ec7n \u00e2m t\u1ea7n th\u00e0nh \u00e2m thanh (t\u00e1i t\u1ea1o \u00e2m thanh)<\/p>\n B\u00e0i 5 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Trong d\u1ee5ng c\u1ee5 n\u00e0o d\u01b0\u1edbi \u0111\u00e2y c\u00f3 c\u1ea3 m\u1ed9t m\u00e1y ph\u00e1t v\u00e0 m\u1ed9t m\u00e1y thu s\u00f3ng v\u00f4 tuy\u1ebfn?<\/span><\/p>\n A. M\u00e1y thu thanh<\/p>\n B. M\u00e1y thu h\u00ecnh<\/p>\n C. Chi\u1ebfc \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng<\/p>\n D. C\u00e1i \u0111i\u1ec1u khi\u1ec3n ti vi<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n C.<\/p>\n B\u00e0i 6 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Ch\u1ecdn c\u00e2u \u0111\u00fang.<\/span><\/p>\n Trong “m\u00e1y b\u1eafn t\u1ed1c \u0111\u1ed9” xe c\u1ed9 tr\u00ean \u0111\u01b0\u1eddng.<\/p>\n A. ch\u1ec9 c\u00f3 m\u00e1y ph\u00e1t s\u00f3ng v\u00f4 tuy\u1ebfn.<\/p>\n B. ch\u1ec9 c\u00f3 m\u00e1y thu s\u00f3ng v\u00f4 tuy\u1ebfn.<\/p>\n C. c\u00f3 c\u1ea3 m\u00e1y ph\u00e1t v\u00e0 m\u00e1y thu s\u00f3ng v\u00f4 tuy\u1ebfn.<\/p>\n D. kh\u00f4ng c\u00f3 m\u00e1y ph\u00e1t v\u00e0 m\u00e1y thu s\u00f3ng v\u00f4 tuy\u1ebfn.<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n C.<\/p>\n B\u00e0i 7 (trang 119 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Bi\u1ebfn \u0111i\u1ec7n s\u00f3ng \u0111i\u1ec7n t\u1eeb l\u00e0 g\u00ec?<\/span><\/p>\n A. L\u00e0 bi\u1ebfn \u0111\u1ed5i s\u00f3ng c\u01a1 th\u00e0nh s\u00f3ng \u0111i\u1ec7n t\u1eeb<\/p>\n B. L\u00e0 tr\u1ed9n s\u00f3ng \u0111i\u1ec7n t\u1eeb t\u1ea7n s\u1ed1 \u00e2m v\u1edbi s\u00f3ng \u0111i\u1ec7n t\u1eeb t\u1ea7n s\u1ed1 cao.<\/p>\n C. L\u00e0 l\u00e0m cho bi\u00ean \u0111\u1ed9 s\u00f3ng \u0111i\u1ec7n t\u1eeb t\u0103ng l\u00ean.<\/p>\n D. L\u00e0 t\u00e1ch s\u00f3ng \u0111i\u1ec7n t\u1eeb t\u1ea7n s\u1ed1 \u00e2m ra kh\u1ecfi s\u00f3ng \u0111i\u1ec7n t\u1eeb t\u1ea7n s\u1ed1 cao.<\/p>\n L\u1eddi gi\u1ea3i:<\/b><\/p>\n Ch\u1ecdn \u0111\u00e1p \u00e1n B.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":" B\u00e0i 1 (trang 119 SGK V\u1eadt L\u00fd 12):\u00a0H\u00e3y n\u00eau b\u1ed1n nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n c\u1ee7a vi\u1ec7c th\u00f4ng tin li\u00ean l\u1ea1c b\u1eb1ng s\u00f3ng v\u00f4 tuy\u1ebfn. L\u1eddi gi\u1ea3i: – \u00a0B\u1ed1n nguy\u00ean t\u1eafc c\u01a1 b\u1ea3n: – \u00a0D\u00f9ng s\u00f3ng v\u00f4 tuy\u1ebfn c\u00f3 b\u01b0\u1edbc s\u00f3ng ng\u1eafn l\u00e0m s\u00f3ng mang \u0111\u1ec3 t\u1ea3i c\u00e1c th\u00f4ng tin. – \u00a0Bi\u1ebfn \u0111i\u1ec7u c\u00e1c s\u00f3ng mang. […]<\/p>\n","protected":false},"author":3,"featured_media":24773,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1303],"tags":[1428,1427],"yoast_head":"\n