Question

In an electromagnetic wave the rms value of electric field is 100v/m . Find intensity of the waves

Answer 1

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Answer 2

Answer:

The intensity of the electromagnetic wave is $1.3281\ W/m^2$

Explanation:

The rms value of electric field is $E_{rms}=100\ V/m$

The speed of light is $c=3\times 10^{8}\ m/s$

We know that the intensity of the electromagnetic wave is

$I=\dfrac{1}{2}\epsilon_{o} E_{rms}^2c$

$I=\dfrac{1}{2}8.854\times 10^{-12}\times 100\times 3\times 10^{8}\\I=1.3281\ W/m^2$