If A is the amplitude of the wave coming from a line source at a distance r, then
Answer & explanation
Correct answer: option 2
For a line source, $I \propto \frac{1}{r}$
and $A \propto \sqrt{I}$ $A \propto r^{-1/2}$
If A is the amplitude of the wave coming from a line source at a distance r, then
Correct answer: option 2
For a line source, $I \propto \frac{1}{r}$
and $A \propto \sqrt{I}$ $A \propto r^{-1/2}$