JEE Main20202 Sep 2020Morning ShiftPhysicsCommunication SystemActual
An amplitude modulated waves is represented by expression v m = 5 1 + 0 . 6 cos 6280 t sin 211 × 10 4 t V . The minimum and maximum amplitudes of the amplitudes modulated wave are, respectively:
Options
- A3 2 V , 5 V
- B5 2 V ,   8 V
- C5 V , 8 V
- D3 V , 5 V
Correct answer
B. 5 2 V ,   8 V
Step-by-step solution
From Given Equation μ = 0 . 6 A m = μ A c A max + A min 2 = A c = 5   V A max - A min 2 = 3   V From Equation (1) + (2) A max = 8   V From Equation (1) – (2) A min = 2   V