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Question

In which direction do the particles vibrate, if sound is travelling from south to north in air?

A
East to West
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B
North to East
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C
West to East
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D
South to North
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Solution

The correct option is D South to North
Sound waves in air are longitudinal. In a longitudinal wave, the medium of the particles vibrate to and fro about its mean position in the direction of the wave.
Hence, if sound is travelling from South to North then air particles will also vibrate in a South - North direction.

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