If the density of air in the lab ,at a point through which a sound wave is passing is
maximum at an instant , the pressure at that point will be :
a) Minimum b) Same as the density of air
c) Equal to the atmospheric pressure d) Maximum

The density of the medium is directly proportional to the sound pressure, so if density decreases to maximum the pressure will decrease to maximum as well.

The correct answer is option (d).

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