Một ánh sáng đơn sắc truyền trong một môi trường với vận tốc v thì chiết suất tuyệt đối của môi trường với ánh sáng đó là

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  ____________ turned out to be true.
  
  

• Choose the best answer for the following sentence:

  My brother,____________ , refused to go to the concert with me.
  
  

• Choose the best answer for the following sentence:

  We climbed to the top of the mountain, ___________ .
   

• Choose the best answer for the following sentence:

  Be sure to follow the instructions __________ .
  
  

• Find a mistake in the four underlined parts of the sentence and correct it:

  That’s the young man whom we met him at the bus-stop last week, isn’t it?

• Find a mistake in the four underlined parts of the sentence and correct it:

  There were several large holes in the road, five of them had to be repaired urgently.

• Find a mistake in the four underlined parts of the sentence and correct it:

  We didn’t want to swim in the sea, that looked very dirty.

• Find a mistake in the four underlined parts of the sentence and correct it:

  I suppose that’s the house where we’ll have to stay in there.

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

  dissolve                 constant                      dominate                     promote

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

  structure                 yesterday                standard                  continue