Frequency spectrum of AM signal

Frequency components of an AM wave (m= modulation index) are

a.) Carrier frequency (ω_c )with amplitude A
b.) Upper side band (ω_c + ω_m) having amplitude mA/2
c.) Lower side band (ω_c - ω_m) having amplitude mA/2
d.) All of the above

Correct Answer: d) all of the above

Explanation:

Frequency components of an AM wave having m modulation index are

- carrier frequency (ω_c ) with amplitude A

- upper side band (ω_c + ω_m) having amplitude mA/2

- lower side band (ω_c - ω_m) having amplitude mA/2

with these components of AM wave, the frequency spectrum may be plotted as