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Which among the following has a frequency selective amplifier whose gain decreases from a finite value to zero as the frequency of the sinusoidal input increases from dc to infinity?

Which among the following has a frequency selective amplifier whose gain decreases from a finite value to zero as the frequency of the sinusoidal input increases from dc to infinity? Correct Answer low pass filter

Low pass filter:

This filter passes the low frequency and blocks or attenuates the high frequency.

It has only one cut off frequency above which it starts to attenuate the signals.

[ alt="Low pass filter" src="//storage.googleapis.com/tb-img/production/20/04/Low%20pass%20filter.png" style=" width: 199px; height: 168px;">

With the increase in frequency we can see that the amplitude response of the filter changes and attenuates to 0 at high frequencies. 

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