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JEE Main 202125 FebruaryEvening Shift

Exam: JEE Main
Year: 2021
Date: 25 February
Shift: Evening Shift
Subject: Physics
Chapter: Communication System

JEE Main 2021 · 25 February · Evening Shift · Physics · Communication System

If a message signal of frequency f _ m is amplitude modulated with...

If a message signal of frequency

{f}_{m}

is amplitude modulated with a carrier signal of frequency

{f}_{c}

and radiated through an antenna, the wavelength of the corresponding signal in air is

Options

A $\dfrac{c}{{f}_{c} - {f}_{m}}$
B $\dfrac{c}{{f}_{m}}$
C $\dfrac{c}{{f}_{c}}$
D $\dfrac{c}{{f}_{c} + {f}_{m}}$

Correct answer

C. $\dfrac{c}{{f}_{c}}$

Step-by-step solution

Given frequency of massage signal

= {f}_{m}

frequency of carrier signal

= {f}_{c}

the wavelength of the corresponding signal in air is

⇒ \lambda = \dfrac{c}{{f}_{c}}

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