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Pressure Wave vs Displacement Wave

The figure sh...

Question

The figure shows graphical representation of a sound wave. The quantities on X and Y axes respectively are

A

Time and displacement

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B

Distance and pressure

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C

Distance and change in density

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D

Density and pressure

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Solution

The correct option is B Distance and pressure
Sound waves are generally described by the pressure waves as $P = P_{o} cos (w t - k x)$
The graphical representation of sound wave is a cosine wave of variation of pressure versus distance.
Thus, X axis represents the distance and Y axis represents the pressure.

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