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JEE Main 202228 JulyMorning Shift
Exam
JEE Main
Year
2022
Date
28 July
Shift
Morning Shift
Subject
Physics
Chapter
Communication System

JEE Main 2022 · 28 July · Morning Shift · Physics · Communication System

In the case of amplitude modulation to avoid distortion the...

In the case of amplitude modulation to avoid distortion the modulation index (μ)\left(\mu\right) should be :

Options

  1. Aμ≤1\mu \le 1
  2. Bμ≥1\mu \ge 1
  3. Cμ=2\mu = 2
  4. Dμ=0\mu = 0

Correct answer

A. μ≤1\mu \le 1

Step-by-step solution

The modulation index of an amplitude modulated signal is defined as the measure or extent of amplitude variation about an un-modulated carrier.

Modulation index is μ=AmAc\mu = \dfrac{{A}_{m}}{{A}_{c}}

To avoid distortion, μ≤1\mu \le 1 because μ>1\mu > 1 will result in interference between career frequency and message frequency, resulting into distortion.

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