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Peak electric field in the wave

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A point source emits light energy uniformly in all directions at an average rate Po with a a single frequency f. Show that the peak electric field in the wave is given by:
Eo = (µocPo/2 r2)
(Everything is under the square root)

I think we have to prove that the peak electric field is that equation but once again I am lost. Please show me a step by step step instructions on how to get this answer.

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This solution provides step-by-step solutions for proving peak electric fields in a wave.

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The power that passes through a sphere of radius R is given by:

Power = S * (4πr2) --- (1)
S = the average value of the Poynting Vector
r = the ...

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