Nguồn sóng trên mặt nước tạo dao động với tần số 10 Hz, gây ra các sóng có biên độ 0,5 cm. Biết khoảng cách giữa 7 ngọn sóng liên tiếp là 30 cm. Vận tốc truyền sóng trên mặt nước là:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  He believes that parents should be made ______________________________ responsible for their children’s behaviour.

   

• Choose the best answer for the following sentence:

  The only sign of ________________________ is that he keeps glancing at his expensive watch.

   

• Choose the best answer for the following sentence:

  I always suffer from feelings of _________________ when I am talking about art with him.

   

• Choose the best answer for the following sentence:

  Your _______________________ is your ability to see clearly with your eyes.

   

• Choose the best answer for the following sentence:

  A person’s or animal’s hearing is the sense which makes it possible fo

  them to be aware of ________________________ .

   

• Choose the best answer for the following sentence:

  When you got lost in the forest you _________________________ very frightened.

   

• Choose the best answer for the following sentence:

  If at any point John feels himself _________________________ tense, he makes a conscious effort to relax.

   

• Choose the correct sentence which is built from the words and phrases given:

  she / admitted / too / fast / drive / through / the / town /.
  
  

• Choose the best answer for the following sentence:

  I ________ him these details, so he __________ some research on his own.

   

• Choose the best answer for the following sentence:

      She _______ a sort of breakdown some years ago, and since then she ______ very shy.