Trong thí nghiệm Iâng về giao thoa ánh sáng khoảng cách giữa hai khe là 0,5 mm, khoảng cách từ hai khe đến màn là 2 m, ánh sáng đơn sắc có bước sóng $0,5\mu m$ . Khoảng cách giữa 5 vân sáng liên tiếp trên màn là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Lan: “What are the main materials for high buildings nowadays?”

  Hung: ''_________, cement, and glass”
  
  

• Choose the best answer for the following sentence:

  Hai: “Don’t forget to phone me!”

  Nhung: “I’ll phone ___________ I arrive”
  
  

• Choose the word that has the underlined part pronounced differently from the rest: 

  hot                  both                      cloth                     spot

• Choose the best answer for the following sentence:

  I think buying a new TV is not a problem with him but he should decide __________ it is necessary or not.
   

• Choose the best answer for the following sentence:

  TV is a bit expensive; we should buy a radio because it is ____________.
   

• Choose the word that has the underlined part pronounced differently from the rest: 

  love                  come                   some                       jog

• Choose the best answer for the following sentence:

  Can you bring the washing in if it _________?
   

• Choose the best answer for the following sentence:

  Tam: “Why is she angry with you?”

  Hoa: “Because I don’t remember that she _____________ me to finish the work before 10.00 a.m.”
  
  

• Choose the best answer for the following sentence:

  What _____________ happen if she refuses our invitation?
   

• Choose a word that has different stress pattern:

  realize                    family                    continue                       proper