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If a sinusoidal wave with intensity 10 W/m2 has an electric field of amplitude E, then a 20 W/m2 wave of the same wavelength will have an electric field of amplitude

Added Sun, 23 Aug '15

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The power is proportional to the square of the E field intensity. 10 is proportional to E^2

so 20 is proportional to 2E^2 so

Et is sqrt(2)E where Et is the Electric field when power/m^2 is 20w/m^2.

Added Sun, 23 Aug '15

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