C\u00e2u 1 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Gi\u1ea3i th\u00edch v\u00ec sao d\u00e2y \u0111\u00e0n gi\u1ed1ng nhau, m\u1eafc tr\u00ean hai h\u1ee3p \u0111\u00e0n c\u00f3 h\u00ecnh d\u1ea1ng k\u00edch th\u01b0\u1edbc kh\u00e1c nhau l\u1ea1i c\u00f3 th\u1ec3 ph\u00e1t ra hai \u00e2m s\u1eafc kh\u00e1c nhau?<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Hai d\u00e2y \u0111\u00e0n gi\u1ed1ng nhau, m\u1eb7c tr\u00ean hai h\u1ed9p \u0111\u00e0n c\u00f3 h\u00ecnh d\u1ea1ng, k\u00edch th\u01b0\u1ee3c kh\u00e1c nhau l\u1ea1i c\u00f3 th\u1ec3 ph\u00e1t ra \u00e2m s\u1eafc kh\u00e1c nhau v\u00ec:<\/p>\n
Hai d\u00e2y d\u00e0n g\u1ed1ng nhau th\u00ec se ph\u00e1t ra \u00e2m c\u01a1 b\u1ea3n gi\u1ed1ng nhau. Nh\u01b0 v\u1eady k\u1ebft qu\u1ea3 l\u00e0m \u00e2m t\u1ed5ng h\u1ee3p c\u00f3 \u00e2m c\u01a1 b\u1ea3n gi\u1ed1ng nhau, c\u00e1c h\u1ecda \u00e2m kh\u00e1c nhau n\u00ean d\u1ea1ng \u0111\u1ed3 th\u1ecb s\u1ebd kh\u00e1c nhau th\u00ec s\u1ebd c\u1ed9ng h\u01b0\u1edfng v\u1edbi c\u00e1c h\u1ecda \u00e2m b\u1eadc kh\u00e1c nhau. Nh\u01b0 v\u1eady k\u1ebft qu\u1ea3 l\u00e0 \u00e2m t\u1ed5ng h\u1ee3p c\u00f3 \u00e2m c\u01a1 b\u1ea3n gi\u1ed1ng nhau, c\u00e1c h\u1ecda \u00e2m kh\u00e1c nhau n\u00ean d\u1ea1ng \u0111\u1ed3 th\u1ecb s\u1ebd kh\u00e1c nhau n\u00ean \u00e2m kh\u00e1c nhau.<\/p>\n
C\u00e2u 2 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0C\u01b0\u1eddng \u0111\u1ed9 \u00e2m v\u00e0 m\u1ef1c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m li\u00ean h\u1ec7 v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o?<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
C\u01b0\u1eddng \u0111\u1ed9 \u00e2m c\u00f3 m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m li\u00ean h\u1ec7 v\u1edbi nhau l\u00e0: M\u1ef1c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m l\u00e0 loga th\u1eadp ph\u00e2n c\u1ee7a t\u1ec9 s\u1ed1 c\u01b0\u1eddng \u0111\u1ed9 \u00e2m I v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 \u00e2m chu\u1ea9n I_0:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-40.png\")
<\/p>\n
\u0111\u01a1n v\u1ecb \u0111o l\u00e0 ben (B).<\/p>\n
B\u00c0I T\u1eacP<\/strong><\/p>\nB\u00e0i 1 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0C\u1ea3m gi\u00e1c v\u1ec1 \u00e2m ph\u1ee5 thu\u1ed9c nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o sau \u0111\u00e2y?<\/span><\/p>\nA. Ngu\u1ed3n \u00e2m v\u00e0 m\u00f4i tr\u01b0\u1eddng ki\u1ec1m truy\u1ec1n \u00e2m.<\/p>\n
B. Ngu\u1ed3n \u00e2m v\u00e0 tai ng\u01b0\u1eddi nghe<\/p>\n
C. M\u00f4i tr\u01b0\u1eddng truy\u1ec1n \u00e2m v\u00e0 tai ng\u01b0\u1eddi nghe.<\/p>\n
D. Tai ng\u01b0\u1eddi nghe v\u00e0 th\u1ea7n kinh th\u1ecb gi\u00e1c.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn B<\/p>\n
B\u00e0i 2 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0\u0110\u1ed9 cao c\u1ee7a \u00e2m ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o sau \u0111\u00e2y?<\/span><\/p>\nA. S\u1ef1 \u0111\u00e0n h\u1ed3i cua ngu\u1ed3n \u00e2m<\/p>\n
B. Bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9n c\u1ee7a ngu\u1ed3n \u00e2m<\/p>\n
C. T\u1ea7n s\u1ed1 c\u1ee7a ngu\u1ed3n \u00e2m<\/p>\n
D. \u0110\u1ed3 th\u1ecb dao \u0111\u1ed9ng c\u1ee7a ngu\u1ed3n \u00e2m.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn C<\/p>\n
B\u00e0i 3 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Tai con ng\u01b0\u1eddi c\u00f3 th\u1ec3 nghe \u0111\u01b0\u1ee3c nh\u1eefng \u00e2m c\u00f3 m\u1ee9c c\u01b0\u1eddng \u0111\u1ed9 \u00e2m trong kho\u1ea3ng<\/span><\/p>\nA. t\u1eeb 0Db \u0111\u1ebfn 1000Db<\/p>\n
B. t\u1eeb 10dB \u0111\u1ebfn 100dB<\/p>\n
C. t\u1eeb 10dB \u0111\u1ebfn 100Db<\/p>\n
D. t\u1eeb 0dB \u0111\u1ebfn 130Db<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn D<\/p>\n
B\u00e0i 4 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0\u0110\u1ed1i v\u1edbi \u00e2m c\u01a1 b\u1ea3n v\u00e0 h\u1ecda \u00e2m b\u1eadc hai do c\u00f9ng m\u1ed9t d\u00e2y d\u00e0n ph\u00e1t ra th\u00ec<\/span><\/p>\nA. H\u1ecda \u00e2m b\u1eadc 2 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn h\u01a1n c\u01b0\u1eddng \u0111\u1ed9 \u00e2m c\u01a1 b\u1ea3n.<\/p>\n
B. T\u1ea7n s\u1ed1 h\u1ecda \u00e2m b\u1eadc 2 g\u1ea5p \u0111\u00f4i t\u1ea7n s\u1ed1 h\u1ecda \u00e2m c\u01a1 b\u1ea3n.<\/p>\n
C. T\u1ea7n s\u1ed1 \u00e2m c\u01a1 b\u1ea3n l\u1edbn g\u1eadp \u0111\u00f4i t\u1ea7n s\u1ed1 h\u1ecda \u00e2m b\u1eadc 2.<\/p>\n
D. T\u1ed1c \u0111\u1ed9 \u00e2m c\u01a1 b\u1ea3n g\u1ea5p \u0111\u00f4i \u0111\u1ed9 h\u1ecda \u00e2m b\u1eadc 2.<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn B<\/p>\n
B\u00e0i 5 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0H\u1ed9p c\u1ed9ng h\u01b0\u1edfng c\u00f3 t\u00e1c d\u1ee5ng<\/span><\/p>\nA. L\u00e0m t\u0103ng t\u1ea7n s\u1ed1 c\u1ee7a \u00e2m<\/p>\n
B. l\u00e0m gi\u1ea3m b\u1edbt c\u01b0\u1eddng \u0111\u1ed9 \u00e2m<\/p>\n
C. l\u00e0m t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 \u00e2m<\/p>\n
D. l\u00e0m gi\u1ea3m \u0111\u1ed9 c\u1ee7a c\u1ee7a \u00e2m<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn C<\/p>\n
B\u00e0i 6 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):<\/b>\u00a0Ti\u1ebfng la h\u00e9t 80 dB c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn g\u1ea5p bao nhi\u00eau l\u1ea7n ti\u1ebfng n\u00f3i th\u1ea7m 20 dB?<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ta c\u00f3:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-41.png\")
<\/p>\n
V\u1eady:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/2-16.png\")
<\/p>\n
V\u1eady ti\u1ebfng h\u00e9t c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 l\u1edbn h\u01a1n ti\u1ebfng n\u00f3i th\u1ea7m 106<\/sup>\u00a0l\u1ea7n.<\/p>\n\n
<\/div>\n<\/div>\n
\n
<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
C\u00c2U H\u1eceI C\u00e2u 1 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0Gi\u1ea3i th\u00edch v\u00ec sao d\u00e2y \u0111\u00e0n gi\u1ed1ng nhau, m\u1eafc tr\u00ean hai h\u1ee3p \u0111\u00e0n c\u00f3 h\u00ecnh d\u1ea1ng k\u00edch th\u01b0\u1edbc kh\u00e1c nhau l\u1ea1i c\u00f3 th\u1ec3 ph\u00e1t ra hai \u00e2m s\u1eafc kh\u00e1c nhau? L\u1eddi gi\u1ea3i: Hai d\u00e2y \u0111\u00e0n gi\u1ed1ng nhau, m\u1eb7c tr\u00ean hai h\u1ed9p \u0111\u00e0n c\u00f3 h\u00ecnh […]<\/p>\n","protected":false},"author":3,"featured_media":25158,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1304],"tags":[1434,1433],"yoast_head":"\n
Ch\u01b0\u01a1ng 3 - B\u00e0i 17: S\u00f3ng \u00e2m. Ngu\u1ed3n nh\u1ea1c \u00e2m<\/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\/chuong-3-bai-17-song-am-nguon-nhac-am\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ch\u01b0\u01a1ng 3 - B\u00e0i 17: S\u00f3ng \u00e2m. Ngu\u1ed3n nh\u1ea1c \u00e2m\" \/>\n<meta property=\"og:description\" content=\"C\u00c2U H\u1eceI C\u00e2u 1 (trang 98 sgk V\u1eadt L\u00ed 12 n\u00e2ng cao):\u00a0Gi\u1ea3i th\u00edch v\u00ec sao d\u00e2y \u0111\u00e0n gi\u1ed1ng nhau, m\u1eafc tr\u00ean hai h\u1ee3p \u0111\u00e0n c\u00f3 h\u00ecnh d\u1ea1ng k\u00edch th\u01b0\u1edbc kh\u00e1c nhau l\u1ea1i c\u00f3 th\u1ec3 ph\u00e1t ra hai \u00e2m s\u1eafc kh\u00e1c nhau? L\u1eddi gi\u1ea3i: Hai d\u00e2y \u0111\u00e0n gi\u1ed1ng nhau, m\u1eb7c tr\u00ean hai h\u1ed9p \u0111\u00e0n c\u00f3 h\u00ecnh […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/chuong-3-bai-17-song-am-nguon-nhac-am\/\" \/>\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=\"2018-04-03T11:01:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-40.png\" \/>\n\t<meta property=\"og:image:width\" content=\"121\" \/>\n\t<meta property=\"og:image:height\" content=\"50\" \/>\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\/chuong-3-bai-17-song-am-nguon-nhac-am\/\",\"url\":\"https:\/\/lop12.edu.vn\/chuong-3-bai-17-song-am-nguon-nhac-am\/\",\"name\":\"Ch\u01b0\u01a1ng 3 - B\u00e0i 17: S\u00f3ng \u00e2m. 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