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:

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: (A) 2.5 watt (B) 0.8 watt (C) 8 watt (D) 10 watt

Tardigrade Admin · Accepted Answer

(P/4 π r2)=I for an isotropic point sound source. ⇒ P=I .4 π r2 =(0.008 w / m 2)(4 . π .102) = 10 watt

Q. 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:

2.5 watt

0.8 watt

8 watt

10 watt

$\frac{P}{4 π r ^{2}} = I$ for an isotropic point sound source.
$\Rightarrow P = I .4 π r^{2}$
$= (0.008 w / m^{2}) (4. π .1 0^{2})$
$= 10$ watt

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