ch17-p108 - 108. The source being isotropic means Asphere =...

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108. The source being isotropic means A sphere = 4 π r 2 is used in the intensity definition I = P / A . Since intensity is proportional to the square of the amplitude (see Eq. 17–27), this further implies 2 2 2 2 22 1 2 11 1 2 /4 m m s I Pr r I sP r r §· π == = ¨¸ π ©¹
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This note was uploaded on 03/20/2010 for the course PHYSICS 191262 taught by Professor Najafzadeh during the Spring '09 term at The Petroleum Institute.

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