Question

A signal of frequency $10\text{kHz}$ and peak voltage of $10\text{V}$ is used to modulate a carrier of frequency $800\text{kHz}$ and peak voltage of $20\text{V}$. What is the amplitude modulation index?

• A. $0.5$
• B. $2.0$
• C. $1.0$
• D. $2.5$

Answer 1

The correct option is A $0.5$

Modulation index is the ratio of the amplitude of the signal wave to the amplitude of the carrier wave.

Hence, modulation index = $\frac{10}{20}=0.5$