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A powerful AM radio station that has a peak output
power of 115 kW emits energy upward and outward but
not downward so that it radiates uniformly across a
hemispherical region as shown in the figure.
Wave fronts
X N/C
Antenna
What is the maximum electric field amplitude of a signal that is received 87 km from the station?
Emax = |0.0427

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