Question

A Low-pass filter circuit has a cut-off frequency of 50 kHz. The bandwidth of the filter is ______________

(a) 24.6 kHz

(b) 50 kHz

(c) 61.5 kHz

(d) 36.9 kHz

I got this question by my college professor while I was bunking the class.

This interesting question is from Advanced Problems on Filters topic in section Filters and Attenuators of Network Theory

Answer 1

Right answer is (b) 50 kHz

For explanation I would say: The bandwidth is defined as the highest cut-off frequency to the lowest cut-off frequency. Here the lowest cut-off frequency is Zero.

For a Low-pass filter therefore, Cut-off Frequency = Bandwidth of the filter

∴ Bandwidth = 50 kHz.