First slide

Intensity of

Question

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 is:

Moderate

A

2.5 watt
B

0.8 watt
C

8 watt
D

10 watt

Solution

$\frac{P}{4 {πr}^{2}} = I$ for an isotropic point sound source.
$\Rightarrow P = I . 4 {πr}^{2}$
= $(0.008 w / m^{2}) (4 . π . 10^{2})$
= 10 watt

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