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Question 20292
JEE Physics · Hard

Principles of Communication: Amplitude Modulation MCQ

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Amplitude ModulationHardQuestion 20292

Question

For an AM wave with μ = 0.6, the ratio of sideband power to total power is:
  1. A
    15.3%
    Correct
  2. B
    26.5%
  3. C
    50%
  4. D
    9%

Correct answer

15.3%

Explanation

Psb = μ²Pc/2 = 0.18Pc. Pt = Pc(1 + 0.18) = 1.18Pc. Ratio = 0.18/1.18 = 15.25% ≈ 15.3%. Even at 100% modulation, sideband fraction = 0.5/1.5 = 33.3%. AM is very power-inefficient compared to SSB.

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