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+1 vote
7.2k views
in Physics by (59.7k points)

A medium wave radio transmitter operating at a wavelength of 492 m has a tower antenna of height 124 m. What is the radiation resistance of the antenna

(a) 25 Ω

(b) 36.5 Ω

(c) 50 Ω

(d) 73 Ω

1 Answer

+2 votes
by (56.9k points)
selected by
 
Best answer

The correct option is (b) 

Explanations:

Medium wave Radio transmitter operating at

λ = 492 m

Height of antenna = 124 m ≅ λ /4

Thus it is a quarter wave monopole hence

Rrad ≅ 36.5 Ω 

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