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Q.

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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a

Increased by a factor of 2

b

Decreased by a factor of 2

c

Decreased by a factor of 4

d

Unchanged

answer is C.

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Detailed Solution

I=2π2a2n2vρ⇒I∝a2n2⇒I1I2=a1a22×n1n22=122×11/42⇒I2=I14
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