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The sound intensity is 0.008 W//m^(2) at...

The sound intensity is `0.008 W//m^(2)` at a distance of `10 m` from an isotropic point source of sound. The power of the source it s approximently :

A

2.5 w

B

0.8 w

C

8 w

D

10 w

Text Solution

Verified by Experts

The correct Answer is:
D
`P/(4pir^(2))`=1 for an isotropic point sound source,
`rArr F=L 4pir^(2)`
`=(0.008w//m^(2))(4.pi.10^(2))`
=10 watt
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