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A 27 mW laser beam has a cross-section...

A 27 mW laser beam has a cross-sectional maximum electric field in this electromagnetic wave is given by :
[Given permittivity of space `in_(0) = 9 xx 10^(12)` SI units, Speed of light `c= 3 xx 10^(8) m//s`]

Text Solution

Verified by Experts

EM wave intensity
`impliesI=("Power")/("Area")=1/2 epsilon_(0)E_(0)^(2)xx3x10^(8)`
`impliesE_(0)=sqrt(2)xx10^(3)kV//m=1.4` kV/m
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