Question
A 1 kW transmitter is emitting clectromagnetic waves (of wavelength $40 \mathrm{~m}$ ) uniformly in all directions. Calculate the electric field at a distance of 1 km from the transmitter.
Step 1
The intensity is given by the power (P) of the transmitter divided by the surface area of the sphere over which the waves are spread. The surface area of a sphere is given by $4\pi r^2$. So, we have: \[I = \frac{P}{4\pi r^2}\] Show more…
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