Một âm thoa có tần số dao động riêng f = 900Hz đặt sát miếng ống hình trụ cao 1,2m. Đổ dần nước vào ống đến độ cao 20cm(so với đáy) thì thấy âm được khuếch đại rất mạch. Tốc độ truyền âm trong không khí là? Giới hạn tốc độ truyền âm trong không khí khoảng từ 300m/s đến 350m/s .        

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Một số câu hỏi khác có thể bạn quan tâm.

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

  Ms Thuy doesn't mind taking care for disabled children.

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

  It took him a long time to get used to drive on the left.

• Choose the best answer for the following sentence:

  The road is _________ for the villagers to travel up and down.
   

• Choose the best answer for the following sentence:

  They informed that the flood __________ the children from ___________ to school.

   

• Choose the best answer for the following sentence:

  I cannot understand why Vinh __________ that he was jealous of me!
   

• Choose the best answer for the following sentence:

  Mai: ''What is the play for the theatre, television or radio?”

  Hung: “__________”
  
  

• Choose the best answer for the following sentence:

  Our bicycle has ___________, which meant we were late for school.
  
  

• Choose the best answer for the following sentence:

  The students in my class spend their break time to __________ about the new coming English teacher.
  
  

• Choose the best answer for the following sentence:

  This is the different website _________ the one she visited last night.
  
  

• Choose the best answer for the following sentence:

  They decided to have a picnic ___________ the pour raining.