question_answer

The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot?       [JEE Main 10-Jan-2019 Evening]

A) 2900 kHz

B) 2750 kHz

C) 2250 kHz

D) 2000 kz

Correct Answer: D

Solution :

[d] Amplitude modulated wave consist of three Waves

are side band frequency

= 250 kHz

Left Side Band

Right Side Band

One new signal is of 250 Hz

For this carrier wave should be taken in such a way that.

LSB, RSB, fc do not overlap with previous frequencies.

as

NTA has given answer [a] but answer should be .