Một sóng có tần số 120 Hz truyền trong một môi trường với tốc độ 60 m/s, bước sóng của nó là ?          

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  If there __________, the rice fields could have been more productive.
   

• Choose the best answer for the following sentence:

  If she _____________ him, she would be very happy.
   

• Choose the best answer for the following sentence:

  If I had enough money, I __________ abroad to improve my English.
  

• Choose the best answer for the following sentence:

  The bench would collapse if they ____________ on it.

   

• Choose the best answer for the following sentence:

  If it __________ convenient, let’s go out for a drink tonight.
   

• Choose the best answer for the following sentence:

  If you ___________ time, please write to me.
   

• Choose the best answer for the following sentence:

  If it _________ tomorrow, we may postpone going on a picnic.
   

• Choose the best answer for the following sentence:

  If you hadn’t watched that late movie last night, you __________ sleepy now.
   

• Choose the best answer for the following sentence:

  If you ___________ as I told you, you __________ sorry now.
   

• Choose the best answer for the following sentence:

  If only I ___________ him now.