The intensity of a particular earthquake wave is measured to be 9.0 ✕ 106 J/m2·s

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The intensity of a particular earthquake wave is measured to be 9.0 ✕ 106 J/m2·s at a distance of 52 km from the source.

(a) What was the intensity when it passed a point only 2.0 km from the source?
 J/m2·s
(b) What was the rate energy passed through an area of 5.0 m2 at 2.0 km?
 W
Apr 1st, 2015

a) I = k/d^2 
Put I = 9.0x10^6 and d =52. Find k=2.4336*10^10 
I'=k/(9km)^2=300444444.4 

b) remember I = Power/Area. I = P/A. You are being asked for power (rate of energy flow). So use : 
P = I x A=300444444.4*25=7511111111

Mar 31st, 2015

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