An electric bell is placed inside a bell jar connected to a vacuum pump. When the jar becomes completely empty, what will happen?
A
No sound can be heard
B
The magnitude of sound will remain unchanged
C
Magnitude of sound will increase
D
Magnitude of sound will decrease
Correct Option:
A
Explanation
Sound is a mechanical wave and requires a medium to propagate. In a vacuum, there are no air molecules to transmit the sound, so the bell cannot be heard.
