NTA Abhyas JEE Main2020PhysicsCommunication SystemPractice
What is the modulation index of an FM signal having a carrier swing of 100 kHz when the modulating signal has a frequency of 8 kHz ?
Options
- A6 . 25
- B6 . 23
- C6 . 55
- D6 . 33
Correct answer
A. 6 . 25
Step-by-step solution
Given: Carrier Swing = 100 k H z f a = 8 k H z From the defining equation, m f = ∆ f f a First determining ∆ f , ∆ f = C a r r i e r S w i n g 2 = 100 × 10 3 2 = 50 k H z Now substituting into the equation for m f m f = 50 × 10 3 8 × 10 3 = 6.25