JEE Main201910 Jan 2019Evening ShiftPhysicsCommunication SystemActual
The modulation frequency of an A M radio station is 250 k H z , which is 10 % of the carrier wave. If another A M station approaches you for license what broadcast frequency will you allot?
Options
- A2750 k H z
- B2000 k H z
- C2250 k H z
- D2900 k H z
Correct answer
B. 2000 k H z
Step-by-step solution
Carrier wave frequency = 250 × 10 = 2500   k H z Frequency used 2500 ± 250 k   Ω = 2250   k H z to 2750   k H z The allotted frequency showed be such that f ± 250   k H z should not overlap with previous one. Hence possible frequency = 2000   k H z