Answer:
Explanation:
Intensity is defined as a time-average measure of the Power density of any wave at a particular location.
Intensity of a wave is inversely proportional to the square of the distance from the source i.e.
[tex]I\propto \frac{1}{d^2}[/tex]
[tex]d_1=15\ km[/tex]
[tex]d_2=49\ km[/tex]
[tex]\frac{I_1}{I_2}=(\frac{d_2}{d_1})^2[/tex]
[tex]\frac{I_1}{I_2}=(\frac{49}{15})^2[/tex]
[tex]\frac{I_1}{I_2}=(3.266)^2[/tex]
[tex]\frac{I_1}{I_2}=10.67[/tex]
