Practicing Success
If A is the amplitude of the wave coming from a line source at a distance r, then |
$A \propto r$ $A \propto r^{-1/2}$ $A\propto r^{-2}$ $A \propto r^{1/2}$ |
$A \propto r^{-1/2}$ |
For a line source, $I \propto \frac{1}{r}$ and $A \propto \sqrt{I}$ $A \propto r^{-1/2}$ |