Question

A ringing bell is located in a chamber. when the air is removed from the chamber, why can the bell be seen vibrating but not be heard?

Answer 1

Answer:

sound requires a medium to be propagated

Explanation:

sound is a mechanical wave and thus requires a medium to be propagated.  Air this case is a medium of travel for the ringing bell in the chamber that is why sound can be heard. When air in the chamber it becomes a vacuum that is why sound is not heard