# 1. At what distance from a 86 W electromagnetic wave point source (like a light bulb) is the...

## Question:

1. At what distance from a 86 W electromagnetic wave point source (like a light bulb) is the amplitude of the electric field 36 V/m?

{eq}\mu _{0} c = 376.991 \Omega {/eq}

## Intensity of the Wave:

The intensity of the electromagnetic wave is dependent on the square of the amplitude of the electric field. The Intensity of the electromagnetic wave is defined as the power of electromagnetic point source divided by the surface area of the surface.

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The intensity of the wave is given as:

{eq}I = \frac{P}{2\pi r} {/eq}

where:

P is the power

r is the distance

The intensity can be written in...