Question

The audio signal used to modulate 60 sin 2$\pi {10}^6$t is 15sin 300$\pi$t. The depth of modulation is

• A. 50%
• B. 40%
• C. 25%
• D. 15%

Answer 1

The correct option is C 25%

$m_a=\frac{E_m}{E_c}=\frac{15}{60}\times 100$ = 25 %