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Find the amplitude of the electric field...

Find the amplitude of the electric field in a parallel bean of light of intensity `2.0 W m^-2.`

Text Solution

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Solution:
The intensity of a plane electromagnetic wave is
` I =(u_av)c = 1/2(varepsilon_0)(E_0^2)c`
` or, E_0 = (sqrt (2I/(varepsilon_0)c))`
` = ( sqrt(2 xx (2.0 W (m^-1))/(8.85 xx (10^-12)(C^1)(N^-1)(m^-2)) xx (3 xx (10^8) m (s^-1))))`
` = 38.8 N (C^-1)`.
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