JEE Main202229 Jul 2022Morning ShiftPhysicsCommunication SystemActual
Find the modulation index of an AM wave having 8 V variation where maximum amplitude of the AM wave is 9 V .
Options
- A0 . 8
- B0 . 5
- C0 . 2
- D0 . 1
Correct answer
A. 0 . 8
Step-by-step solution
Modulation index is given by m = A m A c , where, A m is amplitude of modulating signal and A c is amplitude of carrier signal. Given: 2 A m = 8 A m + A c = 9 ⇒ A c = 5 ∴ m = 4 5 = 0 . 8