An airplane flying at a distance of 45 km from a radio transmitter receives asig

Question

An airplane flying at a distance of 45 km from a radio transmitter receives asignal of intensity 50 µW/m2. The transmitterradiates uniformly over a hemisphere. (a) What is the amplitude of the electric component of the signalat the airplane?
V/m

(b) What is the amplitude of the magnetic component of the signalat the airplane?
T

(c) Calculate the transmission power of the transmitter.
W (a) What is the amplitude of the electric component of the signalat the airplane?
V/m

(b) What is the amplitude of the magnetic component of the signalat the airplane?
T

(c) Calculate the transmission power of the transmitter.
W

Explanation / Answer

(a)   E = 2c I   = 240 * 50 x 10-6  =    0.19416 V/m . (b)   B = E / c =   0.19416 / 3.0 x 108  =    6.47 x10-10 T . (c) Power = I * area = I * 2r2 = 50 x 10-6 * 2 *450002 =   636174 W

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