Question

What is the ratio of the intensities of an earthquake P wave passing through the Earth and detected at two points 15 km and 49 km from the source

Answer 1

Step-by-step 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.

`I\propto (1)/(d^2)`

`d_1=15\ km`

`d_2=49\ km`

`(I_1)/(I_2)=((d_2)/(d_1))^2`

`(I_1)/(I_2)=((49)/(15))^2`

`(I_1)/(I_2)=(3.266)^2`

`(I_1)/(I_2)=10.67`