Question

explain with an example the propagation of sound in a medium

Answer 1

understand this with the help of an experiment.

Take a bell jar. Bell jar is a laboratory equipment used for creating vacuum. Its shape is similar to that of a bell.Place an electric bell in the bell jar.Start pumping out the air of the sealed bell jar. As we start pumping out the air, the sound of electric bell coming out of bell jar starts fading.As soon as vacuum is achieved in the bell jar, no more sound will be audible from the bell jar. However in the bell jar, hammer continues to hit the gong.

This means that still the sound is being produced but now we cannot hear it. This is because sound waves always need a medium to propagate. In the bell jar, it was , hence sound waves cannot travel.

Answer 2

sound wave requires a material medium to travel as it is a mechanical wave....for example...if a bell is in a jar , then it will.ring amd the soumd will be heard ...but as the pressue will be decreased in the jar....the sound will decrease till when it become inaudible....hence propagation of sound requires a medium.