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What is the intensity of an electromagnetic wave with a peak electric field strength of 125V/m?

Short Answer

Expert verified

The intensity is20.74W/m2.

Step by step solution

01

Define electromagnetic waves

Electromagnetic waves are waves that are produced by changes in the electric and magnetic fields.

02

Evaluating the intensity of an electromagnetic wave

If one knows that the energy of every wave is proportional to the square of its amplitude, one may calculate the intensity as follows,

Iavg=cε0E022

Where Iavgis average intensity, is light speed,ε0is the permittivity of free space, and E0is maximum field strength.

Substitute the values in the above equation,

Iavg=3×108m/s8.85×10-12F/m125V/m22=20.74W/m2Therefore,theintensityis20.74W/m2.

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