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Find the amplitude of the electric field...

Find the amplitude of the electric field in a parallel beam of light of intensity `8.0W//m^2`.

Text Solution

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The intensity of plane electro-magnetic wave is given by
`I=u_(av)c=1/2 in_0 E_0^2 or E_0=((2I)/(inc))^(1//2) =[(2.80)/((8.85 xx10^(-12))xx(3xx10^(8)))]^(1//2) =77.6 NC^(-1)`
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