Trong thí nghiệm giao thoa Y-âng, khoảng cách hai khe là 0,5 mm với ánh sáng đơn sắc có bước sóng  thì tại điểm M cách vân sáng trung tâm 1 mm là vị trí vân sáng bậc 2. Nếu dịch màn xa thêm một đoạn  cm theo phương vuông góc với mặt phẳng chứa hai khe thì tại M là vị trí vân tối thứ 2. Bước sóng ánh sáng dùng trong thí nghiệm bằng         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Come and work for my company if you ____________ better to do.
   

• Choose the best answer for the following sentence:

  If you had done as I told you, I think you ____________.
   

• Choose the best answer for the following sentence:

  If he had got half a mark more, he _____________ in the exam.
   

• Choose the best answer for the following sentence:

  “Did you need help with your math last night?”

  “If I had had, I ___________ you.”
   

• Choose the best answer for the following sentence:

  “I’d really like some lunch but I have so much work to do.” “ __________ what you want and I can get it for you.”
   

• Choose the best answer for the following sentence:

  “John went to the hospital alone.” “If __________, I would have gone with him.”
   

• Choose the best answer for the following sentence:

  "Alice is moving to her new apartment next Saturday.” “I’ll be glad to help her, ___________ need some help.”
   

• Choose the best answer for the following sentence:

  “Did you go sailing last weekend?”

  “No. We would have gone ___________ nicer.”
  
  

• Choose the best answer for the following sentence:

  This sailboat ____________ go faster if there were more wind.
   

• Choose the best answer for the following sentence:

  I won’t lend you this money _________ you promise to pay it back.