Multiple choice

What is the difference between a school bell when not in use and when it is producing sound?

  1. Vibrations are produced by the bell when not in use and no vibrations are produced when it is in use.

  2. Vibrations are produced in both cases.

  3. No vibrations are produced whatsoever.

  4. Vibrations are produced when the bell is in use and no vibrations are produced when it is not in use.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 Vibrations are produced when the bell is in use and no vibrations are produced when it is not in use.

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