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Trong thí nghiệm I-âng về giao thoa ánh sáng, các khe sáng được chiếu bằng ánh sáng đơn sắc. Khoảng cách giữa hai khe là 2 mm, khoảng cách từ hai khe đến màn là 4 m. Khoảng cách giữa 5 vân sáng liên tiếp đo được là 4,8 mm. Toạ độ của vân sáng bậc 3 là:

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Trong thí nghiệm I-âng về giao thoa ánh sáng, các khe sáng được chiếu bằng ánh sáng đơn sắc. Khoảng cách giữa hai khe là 2 mm, khoảng cách từ hai khe đến màn là 4 m. Khoảng cách giữa 5 vân sáng liên tiếp đo được là 4,8 mm. Toạ độ của vân sáng […]

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Question 47: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Brave William Baldock , who is six years old , is a hero after helping his mother when she fell downstairs . William quickly rang for an ambulance when he discovered his mother had broken her leg . In spite of being frightened , he (1)_____ the emergency services what had happened and answered all the questions they asked him. He also telephoned his father at work, and then his grandmother, to explain what he had (2)______. While waiting for these people to arrive, William looked after his 18-month-old sister. When ambulance man Steve Lyn went to the house , he was amazed: “It’s great that a young boy of six knew the right number to deal and was able to give us the correct information.” (3)______ of William’s quick thinking , we were able to (4)______ there immediately. Mrs Baldock left hospital yesterday, very (5)______ to both William and the ambulance service. Mrs Baldock left hospital yesterday, very (5)______ to both William and the ambulance service.

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Question 47: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Brave William Baldock , who is six years old , is a hero after helping his mother when she fell downstairs […]

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Đơn giản biểu thức (P = cos left( {alpha – dfrac{pi }{2}} right) + sin left( {alpha – pi } right),,,alpha in mathbb{R}) ta được

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Câu hỏi: Đơn giản biểu thức (P = cos left( {alpha  – dfrac{pi }{2}} right) + sin left( {alpha  – pi } right),,,alpha  in mathbb{R}) ta được  Lời giải tham khảo: Đáp án đúng: D Với (alpha  in mathbb{R}) ta có: (begin{array}{l}P = cos left( {alpha  – dfrac{pi }{2}} right) + sin left( {alpha  – […]

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Question 49: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Brave William Baldock , who is six years old , is a hero after helping his mother when she fell downstairs . William quickly rang for an ambulance when he discovered his mother had broken her leg . In spite of being frightened , he (1)_____ the emergency services what had happened and answered all the questions they asked him. He also telephoned his father at work, and then his grandmother, to explain what he had (2)______. While waiting for these people to arrive, William looked after his 18-month-old sister. When ambulance man Steve Lyn went to the house , he was amazed: “It’s great that a young boy of six knew the right number to deal and was able to give us the correct information.” (3)______ of William’s quick thinking , we were able to (4)______ there immediately. Mrs Baldock left hospital yesterday, very (5)______ to both William and the ambulance service. ” (3)______ of William’s quick thinking , we were able to (4)______ there immediately.

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Question 49: Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks. Brave William Baldock , who is six years old , is a hero after helping his mother when she fell downstairs […]

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Question 20: Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks. GAP YEAR In the professional or career world, a gap year is a year before going to college or university and after finishing high school or (1) ____ a year off before going into graduate school after completing a bachelor as an undergraduate. (2) ____ this time, students may engage in advanced academic courses, extra-academic courses and non-academic courses, such as yearlong pre-college math courses, language studies, learning a trade, art studies, volunteer work, travel, internships , sports and more. Gap years are sometimes considered a way for students to become independent and learn a great deal of (3) ____ prior to engaging in university life. Australians and New Zealanders have a tradition of traveling overseas independently (4) ____ a young age. In New Zealand, this is known as “doing an OE” ​​(Overseas Experience). Sometimes, an OE is (5) ____ to one year, but often Australians and New Zealanders will remain overseas for three to five years, with many working short-term in service industry jobs to fund their continuing travels. Europe and Asia are popular destinations for doing an OE. In Australia, through exchange programs and benefits for youth, there are so many opportunities for a young person to expand their (6) ____ through travel in a gap year. (2)……………….

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Question 20: Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks. GAP YEAR In the professional or career world, a gap year is a year before going to college or university and after finishing high school […]

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Nếu hai đầu đoạn mạch gồm cuộn cảm thuần L mắc nối tiếp với điện trở thuần (R = 1{mkern 1mu} {mkern 1mu} Omega ) vào hai cực của nguồn điện một chiều có suất điện động và điện trở trong (r) không đổi thì trong mạch có dòng điện không đổi cường độ (I). Dùng nguồn điện này để nạp điện cho một tụ điện có điện dung (C = {2.10^{ – 6}}{mkern 1mu} {mkern 1mu} F). Khi điện tích trên tụ điện đạt giá trị cực đại, ngắt tụ điện khỏi nguồn rồi nối tụ điện với cuộn cảm thuần L thành một mạch dao động thì trong mạch có dao động điện từ tự do với chu kì bằng (pi {.10^{ – 6}}{mkern 1mu} {mkern 1mu} s) và cường độ dòng điện cực đại bằng (6I). Giá trị của (r) bằng

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Nếu hai đầu đoạn mạch gồm cuộn cảm thuần L mắc nối tiếp với điện trở thuần (R = 1{mkern 1mu} {mkern 1mu} Omega ) vào hai cực của nguồn điện một chiều có suất điện động và điện trở trong (r) không đổi thì trong mạch có dòng điện không đổi cường độ (I). […]

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