Question

When both the bells are set ringing one after the other, no sound (of ringing bell) is heard in case (ii). Give reason for this observation.​

Answer 1

Answer:

hope this helps you

Explanation:

vaccumm has no molecules or any air inside it so the sound may not be heard outside the bell   so this is the right answer please mark me the brainliest please

Answer 2

Answer:

The ringing of the bell is not heard in case (ii) because the vacuum does not have a material medium.

Explanation:

Sound waves need a material medium to be propagated because sound waves are mechanical longitudinal waves in nature and mechanical waves require a medium, having properties of inertia and elasticity. Initially in case (i) when the bell is full of air, its ringing can be heard as air has medium. But in case (ii) there is no material medium available for the sound of the bell. Since the vacuum does not have a material medium, sound cannot travel through it. Hence, the sound of the bell is no longer heard.