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Question: Answered & Verified by Expert

A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal is/are:

PhysicsCommunication SystemJEE MainJEE Main 2015 (04 Apr)
Options:
  • A 2000 kHz and 1995 kHz
  • B 2 MHz only
  • C 2005 kHz and 1995 kHz
  • D 2005 kHz, 2000 kHz and 1995 kHz
Solution:
2060 Upvotes Verified Answer
The correct answer is: 2005 kHz, 2000 kHz and 1995 kHz
Frequency of signal wave =5 kHz=f. Carrier wave frequency =2MHz

=2000kHz=fc. The resultant signal maximum frequency=f+fc

= 5 + 2 0 0 0 kHz

= 2 0 0 5 kHz

Resultant signal minimum frequency

=fc-f

= 2 0 0 0 - 5 kHz

= 1995 kHz

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