Amplitude and intensity
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(a) What is the ratio of the intensity of an earthquake wave as it passes a point 28 km from the source to the intensity as it passes a point 7 km from the source?
(b) What is the ratio of the amplitude of an earthquake wave as it passes a point 28 km from the source to the amplitude as it passes a point 7 km from the source?
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Solution Summary
The solution explains what is teh relation between wave's amplitude and its intensity and who to calculate the required answers.
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We assume that the wave is a spherical wave from a point source.
The amplitude A of a spherical wave from a point source drops like 1/r where r is the distance from the source.
Intensity ...
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