{"segment":[{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Ch\u1ecdn c\u00e2u tr\u1ea3 l\u1eddi \u0111\u00fang. Trong hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng: ","select":["A. Khi g\u00f3c t\u1edbi t\u0103ng d\u1ea7n th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng t\u0103ng d\u1ea7n.","B. G\u00f3c kh\u00fac x\u1ea1 lu\u00f4n l\u1edbn h\u01a1n g\u00f3c t\u1edbi.","C. G\u00f3c kh\u00fac x\u1ea1 t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi g\u00f3c t\u1edbi.","D. G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi."],"hint":"","explain":"<span class='basic_left'>Khi tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed sang n\u01b0\u1edbc th\u00ec: <br\/>Tia kh\u00fac x\u1ea1 n\u1eb1m trong m\u1eb7t ph\u1eb3ng t\u1edbi<br\/>G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi. <br\/>Khi tia s\u00e1ng truy\u1ec1n t\u1eeb n\u01b0\u1edbc sang kh\u00f4ng kh\u00ed th\u00ec: <br\/>Tia kh\u00fac x\u1ea1 n\u1eb1m trong m\u1eb7t ph\u1eb3ng t\u1edbi<br\/>G\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n g\u00f3c t\u1edbi. <br\/>V\u00e0 khi g\u00f3c t\u1edbi t\u0103ng th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng t\u0103ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3391},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Khi \u00e1nh s\u00e1ng \u0111i t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc, c\u00f3 k\u1ebft lu\u1eadn g\u00ec v\u1ec1 g\u00f3c gi\u1eefa tia s\u00e1ng v\u00e0 \u0111\u01b0\u1eddng ph\u00e1p tuy\u1ebfn t\u1ea1i \u0111i\u1ec3m t\u1edbi?","select":["A. T\u0103ng","B. Kh\u00f4ng k\u1ebft lu\u1eadn \u0111\u01b0\u1ee3c","C. Kh\u00f4ng thay \u0111\u1ed5i","D. Gi\u1ea3m"],"hint":"","explain":"<span class='basic_left'>Khi tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed sang n\u01b0\u1edbc th\u00ec: <br\/>Tia kh\u00fac x\u1ea1 n\u1eb1m trong m\u1eb7t ph\u1eb3ng t\u1edbi<br\/>G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":2}]}],"id_ques":3392},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"C\u00e2u n\u00e0o d\u01b0\u1edbi \u0111\u00e2y li\u1ec7t k\u00ea \u0111\u1ea7y \u0111\u1ee7 nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng?","select":["A. Tia s\u00e1ng l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng.","B. Tia s\u00e1ng truy\u1ec1n t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y sang m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c.","C. Tia s\u00e1ng b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng.","D. Tia s\u00e1ng b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng khi truy\u1ec1n t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y sang m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng tia s\u00e1ng truy\u1ec1n t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y sang m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3393},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0o d\u01b0\u1edbi \u0111\u00e2y tia s\u00e1ng truy\u1ec1n t\u1edbi m\u1eaft l\u00e0 tia kh\u00fac x\u1ea1?","select":["A. Khi ta ng\u1eafm m\u1ed9t b\u00f4ng hoa tr\u01b0\u1edbc m\u1eaft.","B. Khi ta soi g\u01b0\u01a1ng.","C. Khi ta quan s\u00e1t m\u1ed9t con c\u00e1 v\u00e0ng \u0111ang b\u01a1i trong b\u1ec3 c\u00e1 c\u1ea3nh.","D. Khi ta xem chi\u1ebfu b\u00f3ng."],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng tia s\u00e1ng truy\u1ec1n t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y sang m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng. <br\/>M\u00f4i tr\u01b0\u1eddng trong su\u1ed1t th\u1ee9 nh\u1ea5t \u1edf \u0111\u00e2y l\u00e0 kh\u00f4ng kh\u00ed<br\/>M\u00f4i tr\u01b0\u1eddng trong su\u1ed1t th\u1ee9 hai \u1edf \u0111\u00e2y l\u00e0 n\u01b0\u1edbc.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3394},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"M\u1ed9t tia s\u00e1ng \u0111\u00e8n pin \u0111\u01b0\u1ee3c r\u1ecdi t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o m\u1ed9t x\u00f4 n\u01b0\u1edbc trong. T\u1ea1i \u0111\u00e2u s\u1ebd x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng?","select":["A. Tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n trong kh\u00f4ng kh\u00ed.","B. T\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa kh\u00f4ng kh\u00ed v\u00e0 n\u01b0\u1edbc.","C. Tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n trong n\u01b0\u1edbc.","D. T\u1ea1i \u0111\u00e1y x\u00f4 n\u01b0\u1edbc."],"hint":"","explain":"<span class='basic_left'>Hi\u1ec7n t\u01b0\u1ee3ng tia s\u00e1ng truy\u1ec1n t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y sang m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3395},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai40/lv2/img\/h6.jpg'\/><\/center>H\u00ecnh v\u1ebd cho bi\u1ebft PQ l\u00e0 m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa kh\u00f4ng kh\u00ed v\u00e0 n\u01b0\u1edbc, I l\u00e0 \u0111i\u1ec3m t\u1edbi, SI l\u00e0 tia t\u1edbi, IN l\u00e0 ph\u00e1p tuy\u1ebfn. C\u00e1ch v\u1ebd n\u00e0o bi\u1ec3u di\u1ec5n \u0111\u00fang hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 c\u1ee7a tia s\u00e1ng khi \u0111i t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc? Gi\u1ea3i th\u00edch c\u00e1ch l\u1ef1a ch\u1ecdn.","select":["A. H\u00ecnh A","B. H\u00ecnh B","C. H\u00ecnh C","D. H\u00ecnh D"],"hint":"","explain":"<span class='basic_left'>V\u00ec khi \u0111\u00f3 g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":2}]}],"id_ques":3396},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai40/lv2/img\/h7.jpg'\/><\/center>H\u00ecnh v\u1ebd m\u00f4 t\u1ea3 m\u1ed9t b\u1ea1n h\u1ecdc sinh nh\u00ecn qua \u1ed1ng th\u1eb3ng th\u1ea5y \u0111\u01b0\u1ee3c h\u00ecnh \u1ea3nh vi\u00ean s\u1ecfi \u1edf \u0111\u00e1y b\u00ecnh n\u01b0\u1edbc. Gi\u1eef nguy\u00ean v\u1ecb tr\u00ed c\u1ee7a \u1ed1ng, n\u1ebfu b\u1ea1n \u0111\u00f3 d\u00f9ng m\u1ed9t que th\u1eb3ng, d\u00e0i xuy\u00ean qua \u1ed1ng th\u00ec \u0111\u1ea7u que c\u00f3 ch\u1ea1m v\u00e0o vi\u00ean s\u1ecfi kh\u00f4ng? V\u00ec sao?","select":["A. C\u00f3. V\u00ec nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c vi\u00ean s\u1ecfi qua \u1ed1ng th\u1eb3ng.","B. Kh\u00f4ng. V\u00ec vi\u00ean s\u1ecfi kh\u00f4ng n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng c\u1ee7a que.","C. C\u00f3. V\u00ec theo hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.","D. \u0110\u00e1p \u00e1n kh\u00e1c."],"hint":"","explain":"<span class='basic_left'>Gi\u1eef nguy\u00ean v\u1ecb tr\u00ed c\u1ee7a \u1ed1ng, n\u1ebfu b\u1ea1n \u0111\u00f3 d\u00f9ng m\u1ed9t que th\u1eb3ng, d\u00e0i xuy\u00ean qua \u1ed1ng th\u00ec \u0111\u1ea7u que kh\u00f4ng ch\u1ea1m v\u00e0o vi\u00ean s\u1ecfi. V\u00ec vi\u00ean s\u1ecfi kh\u00f4ng n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng c\u1ee7a que.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3397},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"M\u1ed9t con c\u00e1 v\u00e0ng \u0111ang b\u01a1i trong m\u1ed9t b\u1ec3 c\u00e1 c\u1ea3nh c\u00f3 th\u00e0nh b\u1eb1ng th\u1ee7y tinh trong su\u1ed1t. M\u1ed9t ng\u01b0\u1eddi ng\u1eafm con c\u00e1 qua th\u00e0nh b\u1ec3. H\u1ecfi tia s\u00e1ng truy\u1ec1n t\u1eeb con c\u00e1 \u0111\u1ebfn m\u1eaft ng\u01b0\u1eddi \u0111\u00f3 \u0111\u00e3 ch\u1ecbu bao nhi\u00eau l\u1ea7n kh\u00fac x\u1ea1?","select":["A. Kh\u00f4ng l\u1ea7n n\u00e0o","B. M\u1ed9t l\u1ea7n","C. Hai l\u1ea7n","D. Ba l\u1ea7n"],"hint":"","explain":"<span class='basic_left'>V\u00ec t\u1eeb con c\u00e1 truy\u1ec1n \u0111\u1ebfn m\u1eb7t n\u01b0\u1edbc l\u00e0 kh\u00fac x\u1ea1 l\u1ea7n 1 sau \u0111\u00f3 t\u1eeb n\u01b0\u1edbc truy\u1ec1n \u0111\u1ebfn kh\u00f4ng kh\u00ed v\u00e0 t\u1edbi m\u1eaft ta l\u00e0 kh\u00fac x\u1ea1 l\u1ea7n 2.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3398},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"M\u1ed9t c\u1ed1c th\u1ee7y tinh trong, \u0111\u00e1y ph\u1eb3ng, \u0111\u1ef1ng n\u01b0\u1edbc trong, \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u00ean m\u1ed9t t\u1edd gi\u1ea5y c\u00f3 ch\u1eef O. M\u1ed9t ng\u01b0\u1eddi \u0111\u1eb7t m\u1eaft tr\u00ean ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng, nh\u00ecn ch\u1eef O \u0111\u00f3 qua m\u1eb7t n\u01b0\u1edbc trong c\u1ed1c. H\u1ecfi tia s\u00e1ng truy\u1ec1n t\u1eeb ch\u1eef O \u0111\u1ebfn m\u1eaft \u0111\u00e3 ch\u1ecbu bao nhi\u00eau l\u1ea7n kh\u00fac x\u1ea1?","select":["A. M\u1ed9t l\u1ea7n","B. Hai l\u1ea7n","C. Ba l\u1ea7n","D. B\u1ed1n l\u1ea7n"],"hint":"","explain":"<span class='basic_left'>V\u00ec a\u0301nh sa\u0301ng truy\u00ea\u0300n t\u01b0\u0300 ch\u01b0\u0303 O \u0111\u00ea\u0301n \u0111a\u0301y kh\u00fac x\u1ea1 l\u1ea7n 1, t\u01b0\u0300 \u0111a\u0301y \u0111\u00ea\u0301n n\u01b0\u01a1\u0301c l\u00e0 kh\u00fac x\u1ea1 l\u1ea7n 2, t\u01b0\u0300 n\u01b0\u01a1\u0301c \u0111\u00ea\u0301n ko khi\u0301 va\u0300 truy\u00ea\u0300n \u0111\u00ea\u0301n m\u0103\u0301t l\u00e0 kh\u00fac x\u1ea1 l\u1ea7n 3.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3399},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<center><img src='https://www.luyenthi123.com/file/luyenthi123/lop9/vatly/bai40/lv2/img\/h10.jpg'\/><\/center>C\u00f3 m\u1ed9t chi\u1ebfc ca h\u00ecnh tr\u1ee5, b\u1eb1ng nh\u1ef1a kh\u00f4ng trong su\u1ed1t. G\u1ecdi ABCD l\u00e0 m\u1ed9t m\u1eb7t c\u1eaft th\u1eb3ng \u0111\u1ee9ng c\u1ee7a chi\u1ebfc ca (h\u00ecnh 40 \u2013 41.3). M\u1ed9t ng\u01b0\u1eddi \u0111\u1eb7t m\u1eaft theo ph\u01b0\u01a1ng BD, nh\u00ecn v\u00e0o trong ca, v\u1eeba v\u1eb7n kh\u00f4ng th\u1ea5y \u0111\u01b0\u1ee3c \u0111\u00e1y ca. \u0110\u1ed5 n\u01b0\u1edbc v\u00e0o trong ca ng\u01b0\u1eddi \u0111\u00f3 s\u1ebd th\u1ea5y g\u00ec?","select":["A. Ng\u01b0\u1eddi \u1ea5y v\u1eabn kh\u00f4ng nh\u00ecn th\u1ea5y \u0111\u00e1y ca","B. Ng\u01b0\u1eddi \u1ea5y v\u1eabn nh\u00ecn th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a \u0111\u00e1y ca","C. Ng\u01b0\u1eddi \u1ea5y nh\u00ecn th\u1ea5y to\u00e0n b\u1ed9 \u0111\u00e1y ca","D. T\u1ed3i t\u1ec7 h\u01a1n, ng\u01b0\u1eddi \u1ea5y c\u00f2n kh\u00f4ng nh\u00ecn th\u1ea5y c\u1ea3 m\u1ed9t ph\u1ea7n d\u01b0\u1edbi c\u1ee7a th\u00e0nh b\u00ean AB."],"hint":"","explain":"<span class='basic_left'>V\u00ec theo h\u00ecnh v\u1ebd n\u1ebfu ho\u00e0n to\u00e0n nh\u00ecn th\u1ea5y \u0111\u00e1y ca th\u00ec c\u00f3 ngh\u0129a l\u00e0 m\u1eaft nh\u00ecn th\u1ea5y \u0111i\u1ec3m C c\u1ee7a \u0111\u00e1y ca ( \u0111i\u1ec3m A ph\u1ea3i tr\u00f9ng v\u1edbi \u0111i\u1ec3m D th\u00ec m\u1eaft m\u1edbi nh\u00ecn th\u1ea5y \u0111\u01b0\u1ee3c). Th\u1ef1c t\u1ebf hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng kh\u00f4ng th\u1ec3 n\u00e2ng \u0111i\u1ec3m C l\u00ean tr\u00f9ng v\u1edbi \u0111i\u1ec3m D \u0111\u01b0\u1ee3c cho n\u00ean kh\u00f4ng th\u1ec3 ho\u00e0n to\u00e0n nh\u00ecn th\u1ea5y \u0111\u00e1y ca, m\u00e0 ch\u1ec9 th\u1ea5y m\u1ed9t ph\u1ea7n c\u1ee7a \u0111\u00e1y ca.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3400},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"C\u00f3 m\u1ed9t tia s\u00e1ng chi\u1ebfu t\u1eeb kh\u00f4ng kh\u00ed xi\u00ean g\u00f3c v\u00e0o m\u1eb7t n\u01b0\u1edbc th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd l\u1edbn h\u01a1n g\u00f3c t\u1edbi","B. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd b\u1eb1ng g\u00f3c t\u1edbi","C. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd nh\u1ecf h\u01a1n g\u00f3c t\u1edbi","D. C\u1ea3 3 tr\u01b0\u1eddng h\u1ee3p A, B, C \u0111\u1ec1u c\u00f3 th\u1ec3 x\u1ea3y ra"],"hint":"","explain":"<span class='basic_left'>G\u00f3c kh\u00fac x\u1ea1 s\u1ebd nh\u1ecf h\u01a1n g\u00f3c t\u1edbi v\u00ec khi tia s\u00e1ng chi\u1ebfu xi\u00ean g\u00f3c t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc s\u1ebd x\u1ea3y ra hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 n\u00ean \u0111\u00e1p \u00e1n C \u0111\u00fang.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3401},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t tia s\u00e1ng ph\u00e1t ra t\u1eeb m\u1ed9t b\u00f3ng \u0111\u00e8n trong m\u1ed9t b\u1ec3 c\u00e1 c\u1ea3nh, chi\u1ebfu l\u00ean tr\u00ean, xi\u00ean g\u00f3c v\u00e0o m\u1eb7t n\u01b0\u1edbc v\u00e0 l\u00f3 ra ngo\u00e0i kh\u00f4ng kh\u00ed th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd l\u1edbn h\u01a1n g\u00f3c t\u1edbi","B. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd b\u1eb1ng g\u00f3c t\u1edbi","C. G\u00f3c kh\u00fac x\u1ea1 s\u1ebd nh\u1ecf h\u01a1n g\u00f3c t\u1edbi","D. C\u1ea3 3 tr\u01b0\u1eddng h\u1ee3p A, B, C \u0111\u1ec1u c\u00f3 th\u1ec3 x\u1ea3y ra"],"hint":"","explain":"<span class='basic_left'>M\u1ed9t tia s\u00e1ng ph\u00e1t ra t\u1eeb m\u1ed9t b\u00f3ng \u0111\u00e8n trong m\u1ed9t b\u1ec3 c\u00e1 c\u1ea3nh, chi\u1ebfu l\u00ean tr\u00ean, xi\u00ean g\u00f3c v\u00e0o m\u1eb7t n\u01b0\u1edbc v\u00e0 l\u00f3 ra ngo\u00e0i kh\u00f4ng kh\u00ed th\u00ec: G\u00f3c kh\u00fac x\u1ea1 s\u1ebd l\u1edbn h\u01a1n g\u00f3c t\u1edbi<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":1}]}],"id_ques":3402},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Chi\u1ebfu m\u1ed9t tia s\u00e1ng t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o th\u1ee7y tinh v\u1edbi g\u00f3c t\u1edbi b\u1eb1ng ${60}^\\circ C$ th\u00ec:","select":["A. G\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n ${60}^\\circ C$.","B. G\u00f3c kh\u00fac x\u1ea1 b\u1eb1ng ${60}^\\circ C$.","C. G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n ${60}^\\circ C$.","D. C\u1ea3 ba c\u00e2u A, B, C \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n ${60}^\\circ C$. V\u00ec khi chi\u1ebfu tia s\u00e1ng t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o th\u1ee7y tinh g\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n g\u00f3c t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":2}]}],"id_ques":3403},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"Chi\u1ebfu m\u1ed9t tia s\u00e1ng t\u1eeb n\u01b0\u1edbc v\u00e0o kh\u00f4ng kh\u00ed v\u1edbi g\u00f3c t\u1edbi b\u1eb1ng ${30}^\\circ C$ th\u00ec","select":["A. G\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n ${30}^\\circ C$.","B. G\u00f3c kh\u00fac x\u1ea1 b\u1eb1ng ${30}^\\circ C$.","C. G\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n ${30}^\\circ C$.","D. C\u1ea3 ba c\u00e2u A, B, C \u0111\u1ec1u sai."],"hint":"","explain":"<span class='basic_left'>G\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n ${30}^\\circ C$. V\u00ec khi tia s\u00e1ng truy\u1ec1n t\u1eeb n\u01b0\u1edbc sang kh\u00f4ng kh\u00ed g\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n g\u00f3c t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3404},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ch\u1ecdn ph\u00e1t bi\u1ec3u sai:","select":["A. Hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng ch\u1ec9 x\u1ea3y ra t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t.","B. C\u00f3 th\u1ec3 n\u00f3i m\u1eb7t ph\u1eb3ng t\u1ea1o b\u1edfi tia t\u1edbi v\u00e0 tia kh\u00fac x\u1ea1 c\u0169ng l\u00e0 m\u1eb7t ph\u1eb3ng t\u1edbi.","C. G\u00f3c t\u1edbi l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia t\u1edbi v\u00e0 m\u1eb7t ph\u00e2n c\u00e1ch.","D. Khi tia s\u00e1ng chi\u1ebfu vu\u00f4ng g\u00f3c v\u00e0o m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t th\u00ec n\u00f3 s\u1ebd truy\u1ec1n th\u1eb3ng."],"hint":"","explain":"<span class='basic_left'>G\u00f3c kh\u00fac x\u1ea1 l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia kh\u00fac x\u1ea1 v\u00e0 \u0111\u01b0\u1eddng ph\u00e1p tuy\u1ebfn qua \u0111i\u1ec3m t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3405},{"time":24,"part":[{"title":"","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Ch\u1ecdn ph\u00e1t bi\u1ec3u sai:","select":["A. Khi g\u00f3c t\u1edbi b\u1eb1ng ${0}^\\circ C$ th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng b\u1eb1ng ${0}^\\circ C$.","B. C\u00f3 th\u1ec3 n\u00f3i m\u1eb7t ph\u1eb3ng t\u1ea1o b\u1edfi tia t\u1edbi v\u00e0 tia kh\u00fac x\u1ea1 c\u0169ng l\u00e0 m\u1eb7t ph\u1eb3ng t\u1edbi.","C. G\u00f3c t\u1edbi l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia t\u1edbi v\u00e0 \u0111\u01b0\u1eddng ph\u00e1p tuy\u1ebfn qua \u0111i\u1ec3m t\u1edbi.","D. G\u00f3c kh\u00fac x\u1ea1 l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia kh\u00fac x\u1ea1 v\u00e0 tia t\u1edbi."],"hint":"","explain":"<span class='basic_left'>G\u00f3c kh\u00fac x\u1ea1 l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia kh\u00fac x\u1ea1 v\u00e0 \u0111\u01b0\u1eddng ph\u00e1p tuy\u1ebfn qua \u0111i\u1ec3m t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3406},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":"Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang:","select":["A. G\u00f3c kh\u00fac x\u1ea1 bao gi\u1edd c\u0169ng nh\u1ecf h\u01a1n g\u00f3c t\u1edbi.","B. G\u00f3c kh\u00fac x\u1ea1 l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia kh\u00fac x\u1ea1 v\u00e0 tia t\u1edbi.","C. G\u00f3c t\u1edbi l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia t\u1edbi v\u00e0 m\u1eb7t ph\u00e2n c\u00e1ch.","D. G\u00f3c kh\u00fac x\u1ea1 l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia kh\u00fac x\u1ea1 v\u00e0 \u0111\u01b0\u1eddng ph\u00e1p tuy\u1ebfn qua \u0111i\u1ec3m t\u1edbi."],"hint":"","explain":"<span class='basic_left'>G\u00f3c kh\u00fac x\u1ea1 l\u00e0 g\u00f3c t\u1ea1o b\u1edfi tia kh\u00fac x\u1ea1 v\u00e0 \u0111\u01b0\u1eddng ph\u00e1p tuy\u1ebfn qua \u0111i\u1ec3m t\u1edbi.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 D.<\/span><\/span> ","column":1}]}],"id_ques":3407},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":"Ch\u1ecdn ph\u00e1t bi\u1ec3u \u0111\u00fang:","select":["A. Khi tia s\u00e1ng truy\u1ec1n t\u1eeb kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc th\u00ec g\u00f3c kh\u00fac x\u1ea1 l\u1edbn h\u01a1n g\u00f3c t\u1edbi.","B. Khi tia s\u00e1ng truy\u1ec1n t\u1eeb n\u01b0\u1edbc v\u00e0o kh\u00f4ng kh\u00ed th\u00ec g\u00f3c kh\u00fac x\u1ea1 nh\u1ecf h\u01a1n g\u00f3c t\u1edbi.","C. Khi g\u00f3c t\u1edbi b\u1eb1ng ${0}^\\circ C$ th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng b\u1eb1ng ${0}^\\circ C$, tia kh\u00f4ng b\u1ecb g\u00e3y kh\u00fac khi truy\u1ec1n qua hai m\u00f4i tr\u01b0\u1eddng.","D. Hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng tia t\u1edbi khi g\u1eb7p m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c nhau th\u00ec b\u1ecb h\u1eaft tr\u1edf l\u1ea1i m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t c\u0169. \u0110\u1ed9 l\u1edbn g\u00f3c ph\u1ea3n x\u1ea1 b\u1eb1ng g\u00f3c t\u1edbi."],"hint":"","explain":"<span class='basic_left'>Khi g\u00f3c t\u1edbi b\u1eb1ng ${0}^\\circ C$ th\u00ec g\u00f3c kh\u00fac x\u1ea1 c\u0169ng b\u1eb1ng ${0}^\\circ C$, tia kh\u00f4ng b\u1ecb g\u00e3y kh\u00fac khi truy\u1ec1n qua hai m\u00f4i tr\u01b0\u1eddng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 C.<\/span><\/span> ","column":1}]}],"id_ques":3408},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"M\u1ed9t tia s\u00e1ng truy\u1ec1n t\u1eeb n\u01b0\u1edbc ra ngo\u00e0i kh\u00f4ng kh\u00ed c\u00f3 g\u00f3c kh\u00fac x\u1ea1 r:","select":["A. l\u1edbn h\u01a1n g\u00f3c t\u1edbi i.","B. nh\u1ecf h\u01a1n g\u00f3c t\u1edbi i.","C. b\u1eb1ng g\u00f3c t\u1edbi i.","D. C\u1ea3 ba A, B, C \u0111\u1ec1u c\u00f3 kh\u1ea3 n\u0103ng x\u1ea3y ra."],"hint":"","explain":"<span class='basic_left'>M\u1ed9t tia s\u00e1ng truy\u1ec1n t\u1eeb n\u01b0\u1edbc ra ngo\u00e0i kh\u00f4ng kh\u00ed c\u00f3 g\u00f3c kh\u00fac x\u1ea1 r l\u1edbn h\u01a1n g\u00f3c t\u1edbi i.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 A.<\/span><\/span> ","column":2}]}],"id_ques":3409},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0o sau \u0111\u00e2y l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng?","select":["A. Tia s\u00e1ng \u0111i \u0111\u1ebfn m\u1eb7t g\u01b0\u1ee3ng b\u1ecb h\u1eaft ng\u01b0\u1ee3c tr\u1edf l\u1ea1i.","B. Tia s\u00e1ng \u0111i t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng.","C. Tia s\u00e1ng tr\u1eafng \u0111i qua m\u1ed9t l\u0103ng k\u00ednh b\u1ecb ph\u00e2n t\u00edch th\u00e0nh nhi\u1ec1u m\u00e0u.","D. Tia s\u00e1ng tr\u1eafng \u0111i qua m\u1ed9t t\u1ea5m k\u00ednh m\u00e0u \u0111\u1ecf th\u00ec c\u00f3 m\u00e0u \u0111\u1ecf."],"hint":"","explain":"<span class='basic_left'>Tia s\u00e1ng \u0111i t\u1eeb m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t n\u00e0y \u0111\u1ebfn m\u00f4i tr\u01b0\u1eddng trong su\u1ed1t kh\u00e1c b\u1ecb g\u00e3y kh\u00fac t\u1ea1i m\u1eb7t ph\u00e2n c\u00e1ch gi\u1eefa hai m\u00f4i tr\u01b0\u1eddng l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng kh\u00fac x\u1ea1 \u00e1nh s\u00e1ng.<br\/> <span class='basic_pink'>V\u1eady \u0111\u00e1p \u00e1n \u0111\u00fang l\u00e0 B.<\/span><\/span> ","column":1}]}],"id_ques":3410}],"lesson":{"save":0,"level":2}}