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in Physics by (63.7k points)

If an audio signal were to be transmitted directly over a long distance, the minimum size of transmitting antenna would be of the order of 

(1) (500) m

(2) 1 km 

(3) 2 km

(4) 4 km

1 Answer

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Best answer

Correct option: (4) 4 km

Explanation: 

Considering the upper limit of the audio frequency range (i.e. 20 kHz), the wavelength, of the corresponding e.m. wave (of this frequency), would be

The optimum size of the antenna being, of the order of λ/4, we need to have an antenna size of the order of 3.75 km (= 4 km).

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