A spherical source of power 4 W and frequency | vedclass

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Question

(A) The intensity $I$ of a spherical wave at a distance $r$ from a source of power $P$ is given by the formula: $I = \frac{P}{A} = \frac{P}{4\pi r^2}$

Vedclass · Accepted Answer

$8 	imes 10^{-6} W/m^2$

Vedclass · Answer

(A) The intensity $I$ of a spherical wave at a distance $r$ from a source of power $P$ is given by the formula: $I = \frac{P}{A} = \frac{P}{4\pi r^2}$.Given: Power $P = 4 W$,distance $r = 200 m$.Substituting the values: $I = \frac{4}{4\pi 	imes (200)^2}$.$I = \frac{1}{\pi 	imes 40000} = \frac{1}{125663.7} W/m^2$.$I \approx 7.957 	imes 10^{-6} W/m^2$.Rounding to the nearest provided option,we get $I \approx 8 	imes 10^{-6} W/m^2$.

$A$ spherical source of power $4 W$ and frequency $800 Hz$ is emitting sound waves. The intensity of waves at a distance $200 m$ is

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