Q. 61 B

How does sound from a sound producing body travel through air to reach our ears? Illustrate your answer with the help of a labelled diagram.

Answer :

When a body vibrates the air in its neighbourhood is alternately compressed and rarefied. The compressed air has higher pressure than surrounding air. It therefore pushes the air particles near it causing compression to move forward. A rarefaction or low pressure is created at the original place. These compressions and rarefaction cause particles m the air to vibrate about their mean position. The energy is carried forward in these vibration. This is how sound travels.


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