Question

The intensity of an earthquake wave passing through the Earth is measured to be 2.5×10⁶ J/(m2⋅s) at a distance of 47 km from the source.

What was its intensity when it passed a point only 1.0 kmkm from the source?

Express your answer to two significant figures and include the appropriate units.

At what rate did energy pass through an area of 4.0 m2m2 at 1.0 kmkm ?

Express your answer to two significant figures and include the appropriate units.

Answer 1