question_answer

A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pico farad in parallel with a load resistance 100 kilo ohm. Find the maximum modulated frequency which could be detected by it.                                 [JEE MAIN 2013]

A) 10.62 MHz

B) 10.62 kHz

C) 5.31 MHz

D) 5.31 kHz

Correct Answer: D

Solution :

[d] Cut−off frequency is given by

Modulation factor

So, maximum frequency that can be detected should be less than modulation factor

i.e., Less than

Option (4) is correct.