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JEE Main202325 Jan 2023Morning ShiftPhysicsCommunication SystemActual

A message signal of frequency 5 kHz is used to modulate a carrier signal of frequency 2 MHz . The bandwidth for amplitude modulation is:

Options

  1. A5   kHz
  2. B20   kHz
  3. C10   kHz
  4. D2 . 5   kHz

Correct answer

C. 10   kHz

Step-by-step solution

We have, Message frequency f m = 5   kHz and carrier wave frequency f c = 2   MHz = 2000   KHz The resultant signal will have bandwidth of frequency given by f c + f m - f c - f m = [ ( 2000 + 5 ) - ( 2000 - 5 ) ]   kHz = 10   kHz . Thus, bandwidth for amplitude modulation is 10   kHz .

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