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JEE Main202324 Jan 2023Morning ShiftPhysicsCommunication SystemActual

A modulating signal is a square wave, as shown in the figure. If the carrier wave is given as c t = 2 sin 8 π t volts, the modulation index is:

Options

  1. A1 4
  2. B1
  3. C1 3
  4. D1 2

Correct answer

D. 1 2

Step-by-step solution

Modulation index ' μ ' is related to amplitude of modulation signal ' A m ' and amplitude of carrier wave ' A c ' as: μ = A m A c Now, from graph A m = 1   V and from equation of carrier wave A c = 2   V . Therefore, μ = 1 2 .

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