Question

Can you hear the ticking sound of an alarm clock when it is placed inside a bell jar with no air inside it?

Answer 1

1. The propagation of sound is possible with the transfer of vibration of particles to neighboring particles.
2. The more dense the particles are the more the sound will propagate faster.
3. The speed of sound is faster where there is more density.
4. So, there is a need of carrier particles for the sound to carry vibrations and pass it to other.

Thus, we will not be able to hear the ticking sound of an alarm clock when it is placed inside a bell jar with no air inside it.