(a) What is sound? What type of waves are sound waves in air?
(b) Describe an experiment to show that sound cannot pass through vacuum.

(a). The form of energy that makes us able to hear is called sound. In the air, sound waves are longitudinal.

(b). Experiment to demonstrate that sound cannot travel in vacuum:

Experiment 1:

We place a bell in an airtight jar and after ringing the bell, the sound is heard clearly. So it is proved that sound can travel in the air.

Experiment 2:

We place a bell in an air-tight jar that is connected to a vacuum pump. After ringing the bell we hear no sound. That proves that sound cannot travel in a vacuum.

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Updated on: 10-Oct-2022

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