The intensity of an earthquake wave passing through the
Chapter 11, Problem 45(choose chapter or problem)
(II) The intensity of an earthquake wave passing through the Earth is measured to be \(3.0 \times 10^6 \ \mathrm {J/m}^2 \cdot \mathrm s\) at a distance of 54 km from the source. (a) What was its intensity when it passed a point only 1.0 km from the source? (b) At what rate did energy pass through an area of \(2.0 \ \mathrm m^2\) at 1.0 km?
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