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JEE Main 201910 JanuaryEvening Shift

Exam: JEE Main
Year: 2019
Date: 10 January
Shift: Evening Shift
Subject: Physics
Chapter: Communication System

JEE Main 2019 · 10 January · Evening Shift · Physics · Communication System

The modulation frequency of an AM radio station is 250kHz, which is...

The modulation frequency of an

AM

radio station is

250kHz,

which is

10%

of the carrier wave. If another

AM

station approaches you for license what broadcast frequency will you allot?

Options

A $2750kHz$
B $2000kHz$
C $2250kHz$
D $2900kHz$

Correct answer

B. $2000kHz$

Step-by-step solution

Carrier wave frequency

= 250 \times 10 = 2500kHz

Frequency used \left(2500 \pm 250\right)kΩ = 2250kHz

to 2750kHz<br /><br />The allotted frequency showed be such that

f \pm 250kHz

should not overlap with previous one. Hence possible frequency

= 2000kHz

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