Q. The gain of the first order low pass filter

A
Increases at the rate 20dB/decade
B
Decreases at the rate 20dB/decade
C
Increases at the rate 40dB/decade
D
Decreases at the rate 40dB/decade
Solution:

The rate at which the gain of the filter changes in the stop band is determined by the order of filter. So, for a low pass filter the gain decreases at the rate of 20dB/decade.

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