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How can I prove that intensity of a wave is directly proportional to the square of amplitude?
Intensity is Average power transmitted across unit crossectional Area...
I = PA (ds/dt) /A ..........work done
s = s0 sin w(t - x/v)
p = p0 cos w(t - x/v)
put the value of P & s in the above equation and take average in one cycle you will get
Amar Kumar
Askiitians Faculty
m.Tech IIT Delhi
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