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Q.
As the wave propagates, choose the incorrect statement.
Waves
Solution:
For a plane wave intensity (energy crossing per unit area per unit time) is constant at all points.
But for a spherical wave, intensity at a distance $r$ from a point source of power $P$ (energy transmitted per unit time) is given by
$I=\frac{P}{4 \pi r^{2}}$ or $I \propto \frac{1}{r^{2}}$
For a line source
$I=\frac{P}{2 \pi r \ell}$ or $I \propto \frac{1}{r}$
