The AM wave contans three frequencies viz:

Options

A. `(f_(c))/(2),(f_(c)+f_(s))/(2),(f_(c)-f_(s))/(2)`
B. `2f_(c),2(f_(c)+f_(s)),2(f_(c)-f_(s))`
C. `(f_(c),(f_(c)+f_(s)),(f_(c)-f_(s))`
D. `f_(c),f_(c,f_(c)`

Answer

C

Explanation

`C_(m)(t)=(A_(c)+A_(m)sin omega_(m)t)sin omega_(c)t`
`=A_(c) sin omega_(c)t+(muA_(c))/(2)cos(omega_(c)-omega_(m))t`
`-(muA_(c))/(2) cos (omega_(c) + omega_(m))t`