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The intensity of a particular earthquake wave is measured to be 4.0 106 J/m2s at a distance of 49 km from the source. (a) What was the intensity when...

The intensity of a particular earthquake wave is measured to be 4.0 106 J/m2·s at a distance of 49 km from the source.
(a) What was the intensity when it passed a point only 7.0 km from the source?
1 J/m2·s
(b) What was the rate energy passed through an area of 15.0 m2 at 7.0 km?

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