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Question 20235
JEE Physics · Medium

Principles of Communication: Amplitude Modulation MCQ

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Amplitude ModulationMediumQuestion 20235

Question

In AM, the total power P_t is related to carrier power P_c by:
  1. A
    P_t = P_c(1 + μ²)
  2. B
    P_t = P_c(1 + μ²/2)
    Correct
  3. C
    P_t = P_c × μ²/2
  4. D
    P_t = P_c / μ

Correct answer

P_t = P_c(1 + μ²/2)

Explanation

Pt = Pc(1 + μ²/2). For μ = 1 (100% mod.), Pt = 1.5 Pc. The two sidebands together carry μ²Pc/2 = 0.5Pc. Only sideband power carries information; the carrier power is 'wasted.'

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