Q.

In a sound wave, to increase the intensity by a factor of 10, pressure amplitude must be changed by a factor of:

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a

10

b

10

c

102

d

20

answer is A.

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Detailed Solution

I ∝ P02 I'I = P0'2P0  ⇒ P0' = P0I'I⇒P0' = 10 P0
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