Question

An oscillator is producing FM waves of frequency 5 kHz with a variation of 15 kHz. What is the modulation index?

(a) 1.00

(b) 3.00

(c) 0.5

(d) 5.00

The question was asked in a national level competition.

My question is from Communication Systems topic in section Communication Systems of Physics – Class 12

Answer 1

The correct option is (b) 3.00

The best explanation: Modulation index = \(\frac {\triangle f}{f}\)

Modulation index = \(\frac {15 kHz}{5 kHz}\)

Modulation index = 3.