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