Question

An audio signal $15sin2\pi \left(1500\right)t$ amplitude modulates $60sin2\pi \left({10}^5\right)t$. The depth of modulation is:

• A. 25%
• B. 20%
• C. 50%
• D. 40%

Answer 1

The correct option is A 25%

Here audio signal is the modulating wave. The depth of modulation is given as $\frac{E_m}{E_C}=\frac{15}{60}=0.25=25\%$