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Question 20251
JEE Physics · Medium

Principles of Communication: Amplitude Modulation MCQ

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Amplitude ModulationMediumQuestion 20251

Question

In an AM signal, the modulation index μ = 0.8 and the carrier power is 100 W. The total sideband power is:
  1. A
    32 W
    Correct
  2. B
    64 W
  3. C
    80 W
  4. D
    40 W

Correct answer

32 W

Explanation

Sideband power Psb = μ²Pc/2 = (0.64 × 100)/2 = 32 W. Total power = 100 + 32 = 132 W. Only sideband power (32 W out of 132 W) carries useful information.

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