Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
\u00c1nh s\u00e1ng l\u00e0 ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng c\u1ef1c k\u1ef3 c\u1ea7n thi\u1ebft cho s\u1ef1 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a mu\u00f4n lo\u00e0i. N\u1ebfu kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng, con ng\u01b0\u1eddi s\u1ebd sinh ho\u1ea1t, h\u1ecdc t\u1eadp<\/a> v\u00e0 l\u00e0m vi\u1ec7c v\u00f4 c\u00f9ng kh\u00f3 kh\u0103n. Nh\u1edd c\u00f3 \u00e1nh s\u00e1ng m\u00e0 c\u0169ng c\u00f3 nhi\u1ec1u t\u00e1c d\u1ee5ng kh\u00e1c nhau, b\u1ea1n ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u trong b\u00e0i vi\u1ebft n\u00e0y. Ch\u00fang t\u00f4i chia s\u1ebb cho b\u1ea1n th\u00f4ng tin v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng. Ngo\u00e0i ra gi\u00fap c\u00e1c b\u1ea1n li\u1ec7t k\u00ea m\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp ph\u1ed5 bi\u1ebfn v\u00e0 h\u01b0\u1edbng d\u1eabn \u0111\u00e1p \u00e1n. N\u1ebfu b\u1ea1n th\u1ea5y b\u00e0i vi\u1ebft n\u00e0y th\u00fa v\u1ecb v\u00e0 b\u1ed5 \u00edch, h\u00e3y \u0111\u1ecdc h\u1ebft \u0111\u1ec3 trang b\u1ecb th\u00eam cho m\u00ecnh ki\u1ebfn th\u1ee9c nh\u00e9. Ch\u1eafc ch\u1eafn b\u1ea1n s\u1ebd h\u00e0i l\u00f2ng v\u1edbi nh\u1eefng th\u00f4ng tin n\u00e0y. C\u00f9ng b\u1eaft \u0111\u1ea7u ngay th\u00f4i!<\/p>\n\n\n\n L\u1ee3i \u00edch c\u1ee7a \u00e1nh s\u00e1ng l\u00e0 g\u00ec?<\/p>\n\n\n\n \u00c1nh s\u00e1ng l\u00e0 g\u00ec?<\/p>\n\n\n\n Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng, b\u1ea1n n\u00ean bi\u1ebft \u0111\u1ecbnh ngh\u0129a v\u1ec1 \u00e1nh s\u00e1ng. \u00c1nh s\u00e1ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 ch\u1ec9 nh\u1eefng b\u1ee9c x\u1ea1 \u0111i\u1ec7n t\u1eeb, ch\u00fang c\u00f3 b\u01b0\u1edbc s\u00f3ng n\u1eb1m \u1edf trong v\u00f9ng quang ph\u1ed5. \u0110\u00e2y l\u00e0 v\u00f9ng quang ph\u1ed5 c\u00f3 th\u1ec3 nh\u00ecn th\u1ea5y b\u1eb1ng m\u1eaft th\u01b0\u1eddng c\u1ee7a con ng\u01b0\u1eddi. Ngo\u00e0i ra, ch\u00fang c\u00f3 t\u00ean g\u1ecdi l\u00e0 v\u00f9ng kh\u1ea3 ki\u1ebfn (t\u1eeb kho\u1ea3ng 380nm \u0111\u1ebfn 760nm).<\/p>\n\n\n\n \u00c1nh s\u00e1ng \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 gi\u1ed1ng v\u1edbi nh\u1eefng \u0111\u1ee3t s\u00f3ng h\u1ea1t c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed9ng, hay c\u00f2n g\u1ecdi l\u00e0 photon. Ngo\u00e0i ra, \u00e1nh s\u00e1ng c\u00f2n c\u00f3 t\u1ed1c \u0111\u1ed9 r\u1ea5t nhanh. Nh\u00ecn v\u00e0o th\u1ef1c t\u1ebf, c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng khi tr\u1eddi m\u01b0a, ta s\u1ebd th\u1ea5y \u00e1nh ch\u1edbp tr\u01b0\u1edbc. Sau \u0111\u00f3 ta m\u1edbi nghe th\u1ea5y ti\u1ebfng s\u1ea5m r\u1ec1n.<\/p>\n\n\n\n Ngu\u1ed3n s\u00e1ng ch\u00ednh tr\u00ean tr\u00e1i \u0111\u1ea5t l\u00e0 g\u00ec?<\/p>\n\n\n\n Tr\u00ean tr\u00e1i \u0111\u1ea5t, ngu\u1ed3n s\u00e1ng ch\u00ednh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ch\u00ednh l\u00e0 m\u1eb7t tr\u1eddi. Nh\u1edd m\u1eb7t tr\u1eddi m\u00e0 c\u00e1c t\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng m\u1edbi \u0111\u01b0\u1ee3c lan t\u1ecfa r\u1ed9ng kh\u1eafp. Trong l\u1ecbch s\u1eed ghi nh\u1eadn, m\u1ed9t ngu\u1ed3n s\u00e1ng kh\u00e1c c\u0169ng quan tr\u1ecdng kh\u00f4ng k\u00e9m v\u1edbi con ng\u01b0\u1eddi, ch\u00ednh l\u00e0 l\u1eeda. D\u00f9 l\u00e0 l\u1eeda c\u1ed5 x\u01b0a hay l\u00e0 \u0111\u00e8n d\u1ea7u h\u1ecfa c\u00f3 ph\u1ea7n hi\u1ec7n \u0111\u1ea1i, ch\u00fang v\u1eabn r\u1ea5t quan tr\u1ecdng. Tuy nhi\u00ean v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ec7 th\u1ed1ng \u0111i\u1ec7n v\u00e0 \u0111\u00e8n \u0111i\u1ec7n, \u00e1nh s\u00e1ng \u0111i\u1ec7n \u0111\u00e3 \u0111\u01b0\u1ee3c thay th\u1ebf \u00e1nh s\u00e1ng nhi\u1ec7t.<\/p>\n\n\n\n C\u00e1c t\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng l\u00e0 g\u00ec?<\/p>\n\n\n\n Vi\u1ec7c n\u00eau c\u00e1c t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng kh\u00f4ng qu\u00e1 kh\u00f3 kh\u0103n. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng \u00e1nh s\u00e1ng s\u1ebd c\u00f3 3 t\u00e1c d\u1ee5ng c\u01a1 b\u1ea3n. \u0110\u00f3 l\u00e0 t\u00e1c d\u1ee5ng v\u1ec1 quang h\u1ecdc, t\u00e1c d\u1ee5ng v\u1ec1 nhi\u1ec7t h\u1ecdc v\u00e0 t\u00e1c d\u1ee5ng v\u1ec1 sinh h\u1ecdc. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng ch\u1ee9ng t\u1ecf r\u1eb1ng: \u00c1nh s\u00e1ng c\u00f3 n\u0103ng l\u01b0\u1ee3ng. C\u00e1c nh\u00e0 khoa h\u1ecdc nh\u1eadn \u0111\u1ecbnh r\u1eb1ng n\u0103ng l\u01b0\u1ee3ng m\u00e0 \u00e1nh s\u00e1ng mang \u0111\u1ebfn l\u00e0 v\u00f4 t\u1eadn. H\u01a1n n\u1eefa ch\u00fang l\u1ea1i s\u1ea1ch, do \u0111\u00f3 c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng trong t\u01b0\u01a1ng lai. N\u1ebfu mu\u1ed1n t\u00ecm hi\u1ec3u k\u1ef9 v\u00e0 chi ti\u1ebft h\u01a1n, \u0111\u1ecdc ngay ph\u1ea7n d\u01b0\u1edbi \u0111\u00e2y b\u1ea1n nh\u00e9!<\/p>\n\n\n\n T\u00e1c d\u1ee5ng quang \u0111i\u1ec7n c\u1ee7a \u00e1nh s\u00e1ng<\/p>\n\n\n\n Nh\u1eafc \u0111\u1ebfn t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng kh\u00f4ng th\u1ec3 kh\u00f4ng k\u1ec3 \u0111\u1ebfn pin m\u1eb7t tr\u1eddi. \u0110\u00e2y l\u00e0 m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n c\u00f3 kh\u1ea3 n\u0103ng ph\u00e1t ra \u0111i\u1ec7n n\u1ebfu nh\u01b0 c\u00f3 \u00e1nh s\u00e1ng chi\u1ebfu v\u00e0o n\u00f3.<\/p>\n\n\n\n T\u00e1c d\u1ee5ng quang \u0111i\u1ec7n c\u1ee7a \u00e1nh s\u00e1ng l\u00ean tr\u00ean pin quang \u0111i\u1ec7n ch\u00ednh l\u00e0 t\u00e1c d\u1ee5ng quang \u0111i\u1ec7n. Ngo\u00e0i ra, ch\u00fang ta c\u00f3 th\u1ec3 th\u1ea5y m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng c\u1ee7a pin m\u1eb7t tr\u1eddi v\u00e0o trong \u0111\u1eddi s\u1ed1ng, k\u1ef9 thu\u1eadt. \u0110\u00f3 l\u00e0: m\u00e1y t\u00ednh, \u00f4 t\u00f4, m\u00e1y bay\u2026<\/p>\n\n\n\n \u1ee8ng d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng l\u00e0 g\u00ec?<\/p>\n\n\n\n T\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a \u00e1nh s\u00e1ng<\/p>\n\n\n\n Khi \u00e1nh s\u00e1ng chi\u1ebfu v\u00e0o v\u1eadt s\u1ebd l\u00e0m cho ch\u00fang tr\u1edf n\u00ean n\u00f3ng h\u01a1n. L\u00fac \u0111\u00f3, n\u0103ng l\u01b0\u1ee3ng c\u1ee7a \u00e1nh s\u00e1ng \u0111\u00e3 \u0111\u01b0\u1ee3c bi\u1ebfn \u0111\u1ed5i, tr\u1edf th\u00e0nh nhi\u1ec7t n\u0103ng. \u0110\u00f3 \u0111\u01b0\u1ee3c coi l\u00e0 t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a \u00e1nh s\u00e1ng.<\/p>\n\n\n\n M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng d\u1ec5 nh\u1eadn th\u1ea5y c\u1ee7a t\u00e1c d\u1ee5ng nhi\u1ec7t, \u0111\u00f3 ch\u00ednh l\u00e0: Ch\u01b0ng n\u01b0\u1edbc bi\u1ec3n \u0111\u1ec3 t\u1ea1o th\u00e0nh mu\u1ed1i, b\u00ecnh n\u01b0\u1edbc n\u00f3ng n\u0103ng l\u01b0\u1ee3ng m\u1eb7t tr\u1eddi, b\u1ebfp m\u1eb7t tr\u1eddi\u2026<\/p>\n\n\n\n M\u1ed9t s\u1ed1 t\u00e1c h\u1ea1i n\u1ebfu nh\u01b0 s\u1eed d\u1ee5ng qu\u00e1 \u0111\u00e0 t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng ch\u00ednh l\u00e0: H\u1eadu qu\u1ea3 g\u00e2y ra th\u1eddi ti\u1ebft n\u1eafng n\u00f3ng nhi\u1ec1u. B\u0103ng tan, h\u1ea1n h\u00e1n, ch\u00e1y r\u1eebng li\u00ean t\u1ee5c. N\u01b0\u1edbc bi\u1ec3n d\u00e2ng v\u00e0 thi\u1ebfu n\u01b0\u1edbc ng\u1ecdt quanh n\u0103m. Ngo\u00e0i ra, \u0111\u1ed9ng v\u1eadt b\u1ecb thi\u1ebfu n\u01b0\u1edbc v\u00e0 b\u1ecb ch\u1ebft ch\u00e1y li\u00ean t\u1ee5c v\u00ec sa m\u1ea1c h\u00f3a.<\/p>\n\n\n\n T\u00e1c d\u1ee5ng sinh h\u1ecdc c\u1ee7a \u00e1nh s\u00e1ng<\/p>\n\n\n\n T\u00e1c d\u1ee5ng sinh h\u1ecdc c\u1ee7a \u00e1nh s\u00e1ng c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t s\u1ed1 bi\u1ebfn \u0111\u1ed5i nh\u1ea5t \u0111\u1ecbnh cho sinh v\u1eadt. Ngo\u00e0i ra, trong c\u00e1c t\u00e1c d\u1ee5ng n\u00e0y, n\u0103ng l\u01b0\u1ee3ng c\u1ee7a \u00e1nh s\u00e1ng c\u00f3 th\u1ec3 g\u00e2y bi\u1ebfn \u0111\u1ed5i th\u00e0nh c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng c\u1ea7n thi\u1ebft kh\u00e1c cho c\u01a1 th\u1ec3 c\u1ee7a sinh v\u1eadt.<\/p>\n\n\n\n B\u00e0i t\u1eadp v\u00e0 \u0111\u00e1p \u00e1n v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng<\/p>\n\n\n\n Kh\u1ed1i ki\u1ebfn th\u1ee9c c\u1ea7n ph\u1ea3i ghi nh\u1edb<\/p>\n\n\n\n Qua b\u00e0i h\u1ecdc t\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng n\u00e0y, c\u00e1c em c\u1ea7n ph\u1ea3i ghi nh\u1edb \u0111\u01b0\u1ee3c nh\u1eefng ki\u1ebfn th\u1ee9c sau \u0111\u00e2y:<\/p>\n\n\n\n T\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng l\u00e0 g\u00ec? N\u00eau v\u00ed d\u1ee5 minh h\u1ecda c\u1ea7n thi\u1ebft v\u1ec1 nh\u1eefng t\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng.<\/p>\n\n\n\n C\u00f3 th\u1ec3 so s\u00e1nh \u0111\u01b0\u1ee3c ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi v\u1edbi nh\u1eefng ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng kh\u00e1c. N\u0103ng l\u01b0\u1ee3ng kh\u00e1c k\u1ec3 \u0111\u1ebfn \u1edf \u0111\u00e2y ch\u00ednh l\u00e0 n\u0103ng l\u01b0\u1ee3ng h\u1ea1t nh\u00e2n, n\u0103ng l\u01b0\u1ee3ng h\u00f3a th\u1ea1ch. D\u1ef1a v\u00e0o c\u00e1c ti\u00eau ch\u00ed nh\u01b0: t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng, ti\u1ec1m n\u0103ng trong t\u01b0\u01a1ng lai\u2026 \u0111\u1ec3 nghi\u00ean c\u1ee9u. T\u1eeb \u0111\u00f3, c\u00e1c em c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng ch\u00ednh c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u01b0\u01a1ng lai.<\/p>\n\n\n\n N\u00eau \u0111\u01b0\u1ee3c nh\u1eefng \u1ee9ng d\u1ee5ng trong vi\u1ec7c s\u1eed d\u1ee5ng n\u0103ng l\u01b0\u1ee3ng \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi. Ch\u00fang c\u00f3 t\u00e1c \u0111\u1ed9ng g\u00ec v\u00e0o \u0111\u1eddi s\u1ed1ng th\u1ef1c t\u1ebf v\u00e0 k\u1ef9 thu\u1eadt?<\/p>\n\n\n\n \u00c1nh s\u00e1ng r\u1ea5t c\u1ea7n thi\u1ebft cho c\u00e2y c\u1ed1i<\/p>\n\n\n\n B\u00e0i t\u1eadp<\/p>\n\n\n\n B\u00e0i 1: Gi\u1ea3i th\u00edch v\u1ec1 hi\u1ec7n t\u01b0\u1ee3ng t\u1ea1i sao nh\u1eefng b\u00ecnh ch\u1ee9a d\u1ea7u, ch\u1ee9a x\u0103ng \u1edf tr\u00ean xe \u00f4 t\u00f4, toa t\u00e0u ch\u1edf d\u1ea7u ph\u1ea3i s\u01a1n nh\u1eefng m\u00e0u s\u1eafc nh\u01b0 v\u00e0ng, b\u1ea1c, tr\u1eafng?<\/p>\n\n\n\n B\u00e0i 2: S\u1eed d\u1ee5ng t\u00e1c d\u1ee5ng n\u00e0o c\u1ee7a \u00e1nh s\u00e1ng \u0111\u1ec3 l\u00e0m nh\u1eefng c\u00f4ng vi\u1ec7c sau \u0111\u00e2y?<\/p>\n\n\n\n A, \u1ede m\u1ed9t b\u1ec7nh vi\u1ec7n, ng\u01b0\u1eddi ta s\u1eed d\u1ee5ng tia t\u1eed ngo\u1ea1i \u0111\u1ec3 di\u1ec7t tr\u00f9ng c\u00e1c h\u00e0nh lang. Tia t\u1eed ngo\u1ea1i l\u00e0 lo\u1ea1i \u00e1nh s\u00e1ng m\u00e0 kh\u00f4ng g\u00e2y ra c\u1ea3m gi\u00e1c.<\/p>\n\n\n\n B, Ng\u01b0\u1eddi ta m\u1edf tivi b\u1eb1ng \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa. Chi\u1ebfc \u0111i\u1ec1u khi\u1ec3n n\u00e0y khi\u1ec3n n\u00e0y khi b\u1ea5m s\u1ebd ph\u00e1t ra \u00e1nh s\u00e1ng h\u1ed3ng ngo\u1ea1i. \u00c1nh s\u00e1ng n\u00e0y ta kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c. ch\u00fang t\u00e1c d\u1ee5ng v\u00e0o b\u1ed9 ph\u1eadn thu c\u1ee7a tivi. T\u1eeb \u0111\u00f3 khi\u1ebfn cho tivi \u0111\u01b0\u1ee3c ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n C, Ph\u01a1i l\u1ea1c kh\u00f4 d\u01b0\u1edbi n\u1eafng \u0111\u1ec3 l\u1ea1c kh\u00f4ng b\u1ecb m\u1ed1c.<\/p>\n\n\n\n B\u00e0i 3: T\u00e1c d\u1ee5ng n\u00e0o d\u01b0\u1edbi \u0111\u00e2y kh\u00f4ng ph\u1ea3i do \u00e1nh s\u00e1ng g\u00e2y ra? Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t<\/p>\n\n\n\n A T\u00e1c d\u1ee5ng sinh h\u1ecdc<\/p>\n\n\n\n B T\u00e1c d\u1ee5ng t\u1eeb<\/p>\n\n\n\n C T\u00e1c d\u1ee5ng quang \u0111i\u1ec7n<\/p>\n\n\n\n D T\u00e1c d\u1ee5ng nhi\u1ec7t<\/p>\n\n\n\n B\u00e0i 4 V\u00e0o m\u00f9a h\u00e8, l\u00fac ban ng\u00e0y, ch\u00fang ta kh\u00f4ng n\u00ean m\u1eb7c nh\u1eefng qu\u1ea7n \u00e1o t\u1ed1i m\u00e0u. L\u00fd do t\u1ea1i sao?<\/p>\n\n\n\n A Qu\u1ea7n \u00e1o t\u1ed1i m\u00e0u t\u00e1n x\u1ea1 \u00e1nh s\u00e1ng \u00edt, th\u1ebf n\u00ean ta c\u1ea3m th\u1ea5y m\u00e1t<\/p>\n\n\n\n B Qu\u1ea7n \u00e1o t\u1ed1i m\u00e0u t\u00e1n x\u1ea1 \u00e1nh s\u00e1ng nhi\u1ec1u, n\u00ean ta c\u1ea3m th\u1ea5y n\u00f3ng<\/p>\n\n\n\n C Qu\u1ea7n \u00e1o t\u1ed1i m\u00e0u gi\u00fap h\u1ea5p th\u1ee5 \u00e1nh s\u00e1ng nhi\u1ec1u, n\u00ean ta c\u1ea3m th\u1ea5y n\u00f3ng<\/p>\n\n\n\n D Qu\u1ea7n \u00e1o t\u1ed1i m\u00e0u gi\u00fap h\u1ea5p th\u1ee5 \u00edt \u00e1nh s\u00e1ng h\u01a1n, n\u00ean ta c\u00f3 c\u1ea3m gi\u00e1c n\u00f3ng<\/p>\n\n\n\n \u0110\u00e1p \u00e1n<\/p>\n\n\n\n B\u00e0i 1: Nh\u1eefng b\u00ecnh ch\u1ee9a d\u1ea7u, ch\u1ee9a x\u0103ng \u1edf tr\u00ean c\u00e1c toa ch\u1edf h\u00e0ng b\u1eaft bu\u1ed9c ph\u1ea3i s\u01a1n m\u00e0u s\u1eafc nh\u01b0 v\u1eady. L\u00fd do l\u00e0 b\u1edfi ch\u00fang s\u1ebd h\u1ea5p th\u1ee5 \u00edt n\u0103ng l\u01b0\u1ee3ng c\u1ee7a \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi h\u01a1n. T\u1eeb \u0111\u00f3 l\u00e0m gi\u1ea3m \u0111i s\u1ef1 n\u00f3ng l\u00ean c\u1ee7a ch\u00fang khi ph\u01a1i ngo\u00e0i n\u1eafng m\u1ed9t th\u1eddi gian d\u00e0i.<\/p>\n\n\n\n B\u00e0i 2:<\/p>\n\n\n\n A, Vi\u1ec7c s\u1eed d\u1ee5ng tia h\u1ed3ng ngo\u1ea1i \u0111\u1ec3 ti\u1ec7t tr\u00f9ng c\u00e1c h\u00e0nh lang c\u1ee7a b\u1ec7nh vi\u1ec7n l\u00e0 \u0111\u00e3 s\u1eed d\u1ee5ng t\u00e1c d\u1ee5ng sinh h\u1ecdc c\u1ee7a \u00e1nh s\u00e1ng.<\/p>\n\n\n\n B, Vi\u1ec7c m\u1edf tivi ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng \u0111i\u1ec1u khi\u1ec3n t\u1eeb xa l\u00e0 ta \u0111\u00e3 s\u1eed d\u1ee5ng t\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng. C\u1ee5 th\u1ec3 \u0111\u00e2y l\u00e0 t\u00e1c d\u1ee5ng quang \u0111i\u1ec7n c\u1ee7a tia h\u1ed3ng ngo\u1ea1i.<\/p>\n\n\n\n C, Khi ph\u01a1i l\u1ea1c ra n\u1eafng cho \u0111\u1ee1 m\u1ed1c, ta s\u1eed d\u1ee5ng t\u00e1c d\u1ee5ng nhi\u1ec7t c\u1ee7a \u00e1nh s\u00e1ng t\u1eeb m\u1eb7t tr\u1eddi.<\/p>\n\n\n\n B\u00e0i 3: \u0110\u00e1p \u00e1n B. \u00c1nh s\u00e1ng ch\u1ec9 c\u00f3 t\u00e1c d\u1ee5ng sinh h\u1ecdc, t\u00e1c d\u1ee5ng quang \u0111i\u1ec7n, t\u00e1c d\u1ee5ng nhi\u1ec7t.<\/p>\n\n\n\n B\u00e0i 4: \u0110\u00e1p \u00e1n C.<\/p>\n\n\n\n G\u1ee3i \u00fd v\u1ec1 t\u00e1c d\u1ee5ng \u00e1nh s\u00e1ng<\/p>\n\n\n\n Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin m\u00e0 ch\u00fang t\u00f4i cung c\u1ea5p cho b\u1ea1n \u0111\u1ecdc v\u1ec1 t\u00e1c d\u1ee5ng c\u1ee7a \u00e1nh s\u00e1ng. Ch\u00fang t\u00f4i tin r\u1eb1ng nh\u1eefng chia s\u1ebb m\u00e0 m\u00ecnh mang \u0111\u1ebfn cho b\u1ea1n \u0111\u1ecdc \u0111\u00e3 gi\u00fap b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c nh\u1eefng th\u00f4ng tin b\u1ed5 \u00edch. \u0110\u1eebng qu\u00ean tham kh\u1ea3o nh\u1eefng b\u00e0i vi\u1ebft kh\u00e1c c\u1ee7a Vietlearn tr\u00ean website b\u1ea1n nh\u00e9! Nh\u1eefng ki\u1ebfn th\u1ee9c v\u1eadt l\u00fd l\u1edbp 9 n\u00e0y c\u1ef1c k\u1ef3 quan tr\u1ecdng, l\u00e0 h\u00e0nh trang \u0111\u1ec3 b\u1ea1n v\u1eefng b\u01b0\u1edbc h\u1ecdc t\u1eadp<\/a> \u1edf c\u1ea5p 3 \u0111\u00f3. V\u00ed d\u1ee5 b\u00e0i vi\u1ebft v\u1ec1 c\u00f4ng d\u1ee5ng c\u1ee7a k\u00ednh l\u00fap nh\u1eadn \u0111\u01b0\u1ee3c l\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c r\u1ea5t cao. \u0110\u00e2y l\u00e0 l\u1ef1a ch\u1ecdn \u00f4n t\u1eadp c\u1ee7a r\u1ea5t nhi\u1ec1u h\u1ecdc sinh<\/a> \u0111ang mu\u1ed1n b\u01b0\u1edbc<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn \u00c1nh s\u00e1ng l\u00e0 ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng c\u1ef1c k\u1ef3 c\u1ea7n thi\u1ebft cho s\u1ef1 sinh tr\u01b0\u1edfng v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a mu\u00f4n lo\u00e0i. N\u1ebfu kh\u00f4ng c\u00f3 \u00e1nh s\u00e1ng, con ng\u01b0\u1eddi s\u1ebd sinh ho\u1ea1t, h\u1ecdc t\u1eadp v\u00e0 l\u00e0m vi\u1ec7c v\u00f4 c\u00f9ng kh\u00f3 kh\u0103n. Nh\u1edd c\u00f3 \u00e1nh s\u00e1ng m\u00e0 c\u0169ng c\u00f3 nhi\u1ec1u t\u00e1c d\u1ee5ng […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[4,7],"tags":[],"class_list":["post-1193","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=1193"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1193\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}