An electric bell is kept under a bell jar in which a vacuum has been created. Slowly air is introduced in to the jar. What will happen to the sound of the electric bell?Select one of the options below as your answer:
A. It will increase until it reaches its maximum.
B. It will decrease until it stops.
C. It will not change.
D. It will increase and decrease periodically
.E. It will decrease exponentially

Question

shane_b · Answer

http://www.youtube.com/watch?v=ce7AMJdq0Gw

anonymous · Answer

A. It will increase until it reaches its maximum.

souvik · Answer

sound can not travel through vacuum

chenping · Answer

As the air is introduced into the bell jar, the air vibrates to produce sound. So eventually the sound will increase to maximum. 
:D