Q80 / 90 · JEE Main 2022 (28 Jul Shift 2) · Physics

A FM Broad cast transmitter, using modulating signal of frequency 20kHz has a deviation ratio of 10. The Bandwidth required for transmission is :

  • A
    220kHz
  • B
    180kHz
  • C
    360kHz
  • Correct answer
    D
    440kHz

Solution

Given

FM broadcast

Modulating frequency =20 kHz=f

Deviation ratio = frequency deviation  modulating frequency =∆ff

⇒ Frequency deviation, Δf=f×10

=20 kHz×10=200 kHz

⇒ Bandwidth =2f+Δf

=220+200 kHz

=440 kHz

Hence, the correct answer is option: 'D'.

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