Question: Equation 17.7 states that, at distance r away from a point source with power Pav, the wave intensity is 1 = Pav / 4r2 Study

Equation 17.7 states that, at distance r away from a point source with power Pav, the wave intensity is 1 = Pav / 4πr2 Study Figure 17.9 and prove that, at distance r straight in front of a point source with power Pav moving with constant speed vS, the wave intensity is
1 = Pav / 4πr2 (v ─vs / v)

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