Q.

A sound source emits sound waves in a uniform medium. If energy density is E and maximum speed of the particles of the medium is vmax. The plot between E and vmax is best represented by

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a

b

c

d

answer is C.

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Detailed Solution

Energy density (E)  =Iv=2π2ρn2A2vmax=ωA=2πnA⇒E∝(vmax)2i.e., graph between E and vmax will be a parabola symmetrical about E axis.
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