Principles of Communication: Antenna MCQ

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AntennaMediumQuestion 20256

Question

A radio station broadcasts at 900 kHz. The wavelength and the minimum antenna height required are:

A
λ = 333 m, h = 83.3 m
Correct
B
λ = 333 m, h = 166.5 m
C
λ = 3.33 m, h = 0.83 m
D
λ = 3.33 km, h = 833 m

Correct answer

λ = 333 m, h = 83.3 m

Explanation

λ = c/f = 3×10⁸ / 9×10⁵ = 333.3 m. Minimum antenna height (λ/4 monopole) = 333/4 ≈ 83.3 m. This explains why AM radio towers are enormous structures.

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