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Intensity of Earthquake

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(a) What is the ratio of the intensity of an earthquake wave as it passes a point 21 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 21 km from the source to the amplitude as it passes a point 7 km from the source?

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The intensity of an earthquake is examined.

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Hi,

This is how we shall solve it :

(a) Let intensity I be at distance R from the source.
Let intensity I' be at distance R' from the ...

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