NTA Abhyas JEE Main2020PhysicsCommunication SystemPractice
A carrier wave of peak voltage 12 V is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of 75 % is
Options
- A8   V
- B6   V
- C7   V
- D9 V
Correct answer
D. 9 V
Step-by-step solution
Here A c = 12 V , A m = ? modulation index μ c = 75 % = 0 .75 Since μ c = A m A c ⇒ 0 .75 = A m 12 A m = 0 .75 × 12 = 9 V