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An electric bell is placed inside a bell jar which is closed air tight. If the bell is ringing and the air is slowly removed with the help of a vacuum pump, then:

An electric bell is placed inside a bell jar which is closed air tight. If the bell is ringing and the air is slowly removed with the help of a vacuum pump, then: Correct Answer The amplitude of vibration of the air column decreases

The correct answer is The amplitude of vibration of the air column decreases.

Key Points

  • The sound of the bell steadily decreases. When a vacuum is achieved inside the jar, the sound of the bell will not be heard.
  • The amplitude of vibration of the air column decreases. We can infer that sound needs a material medium for its travel.

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