As a wave propagates
IIT 1999, Medium
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(d) For a travelling wave, the intensity of wave remainsconstant if it is a plane wave.
Intensity of wave is inversely proportional to the square of the distance from the source if the wave is spherical
$\left( {I = \frac{P}{{4\pi {r^2}}}} \right)$
Intensity of spherical wave on the spherical surface centred at source always remains same. Here total intensity means power $P$.
Intensity of wave is inversely proportional to the square of the distance from the source if the wave is spherical
$\left( {I = \frac{P}{{4\pi {r^2}}}} \right)$
Intensity of spherical wave on the spherical surface centred at source always remains same. Here total intensity means power $P$.
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