Question

Amplitude modulation has

• A. one carrier with two side band frequencies
• B. one carrier
• C. one carrier with infinite frequencies
• D. one carrier with high frequency

Answer 1

Answer: (A)

one carrier with two side band frequencies

Answer 2

Amplitude modulation has one carrier with two side band frequencies. The AM wave contains three frequencies $f_{e} \cdot\left(f_{e}+f_{m}\right)$ and $\left(f_{c}-f_{m}\right) . f_{o}$ is called carrier frequency, $\left(f_{c}+f_{m}\right)$ is upper side band (USB frequency) and $\left(f_{c}-f_{m}\right)$ is lower side band frequency.