Question

Find the modulation index of an AM wave having $8V$ variation where maximum amplitude of the AM wave is $9V$.

• A. $0.8$
• B. $0.5$
• C. $0.2$
• D. $0.1$

Answer 1

Answer: (A)

Modulation index: $m=\frac{A_m}{A_c}$
Given $2A_m=8$
$A_m+A_c=9\Rightarrow A_c=5$
$\therefore m=\frac{4}{5}=0.8$