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JEE Main 202225 JulyEvening Shift

Exam: JEE Main
Year: 2022
Date: 25 July
Shift: Evening Shift
Subject: Physics
Chapter: Communication System

JEE Main 2022 · 25 July · Evening Shift · Physics · Communication System

In AM modulation, a signal is modulated on a carrier wave such that...

In

AM

modulation, a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be

6V

and

2V

respectively. The modulation index is

Options

A $100 %$
B $80 %$
C $60 %$
D $50 %$

Correct answer

D. $50 %$

Step-by-step solution

Given here, ${V}_\max = 6V$ and ${V}_\min = 2V$
Now, modulation index $= \dfrac{{V}_\max - {V}_\min}{{V}_\max + {V}_{min .}} \times 100 %$
$= \dfrac{6 - 2}{6 + 2} \times 100 % = 50 %$

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