The intensity of a particular earthquake wave is measured to be 2.09à?106 W/m2 at a distance of 123 km from the source. What was the intensity when is passed a point only 4.39 km from the source? Give answer in W/m2.
The intensity of a wave is defined as the energy per unit time crossing unit area held at right angles to the direction of propagation of the wave.
For waves spreading out radially from a point source, ...
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