Determine the order of a low pass filter with Butterworth approximation which has pass band gain of -2 dB for 0 ≤ ω ≤ 10 and stop band gain of -20 dB for ω ≥ 20.

Determine the order of a low pass filter with Butterworth approximatio

1.	Determine the order of a low pass filter with Butterworth approximation which has pass band gain of -2 dB for 0 ≤ ω ≤ 10 and stop band gain of -20 dB for ω ≥ 20.
A.	2
B.	5
C.	4
D.	6
Answer» D. 6