1. Aim:
To prove that sound cannot travel through 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 in 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.
