Question

In an amplitude modulation with modulation index $0.5$, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is

• A. $4:1$
• B. $1:1$
• C. $1:2$
• D. $2:1$
• E. $1:4$

Answer 1

The correct option is A $4:1$

Modulation index $=0.5=\frac{1}{2}$
$A_{sideband}=\frac{\mu A_c}{2}$
$\frac{A_{sideband}}{A_c}=\frac{\mu }{2}=\frac{1}{4}$
or $\frac{A_c}{A_{sideband}}=\frac{4}{1}$