Question

Describe an experiment to show that sound cannot travel through vaccum.

Answer 1

1. Aim:
   To prove that sound cannot travel through a vacuum and it needs a medium for propagation.
2. Materials Required:
   Bell jar, mobile phone, and vacuum pump.

• Procedure:

1. Take a bell jar and a mobile phone.
2. Switch on the music on the mobile phone and place it in the jar.
3. Now, pump out the air from the bell jar using a vacuum pump.
4. As more and more air is removed from the jar, the sound from the mobile phone becomes feebler and finally, very faint.
   

• Conclusion:
  This experiment proves that sound cannot travel in vacuum and it needs a medium.