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Q.

The sound intensity is 0.008 W/m2 at a distance of 10 m from an isotropic point source of sound. The power of the source is:

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a

0.8 watt

b

10 watt

c

8 watt

d

2.5 watt

answer is D.

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Detailed Solution

P4πr2 = I  for an isotropic point sound source.

⇒P = I.4 πr2

 = (0.008 w/m2)(4.π.102)

 = 10 watt

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