Question

A cellphone is placed in a glass and air is sucked out of the glass, how does the ringing sound of the cellphone change? why?

Answer 1

The ringing willnt sound because there is no air in the glass and as we know that sound travels in air.

Answer 2

There will no sound comes from cellphone.

sound will not come because there are no air molecules are present in glass vessel. as we know sound needs molecule to travel.