-Refer to the figure above. If the output voltage at the upper cutoff frequency was 7.19 Vp- p, the output voltage that would be expected at the lower cutoff frequency is
A)2.11 Vp- p.
B)5.08 Vp- p.
C)7.19 Vp- p.
D)10.17 Vp- p.

Question

-Refer to the figure above. If the output voltage at the upper cutoff frequency was 7.19 Vp- p, the output voltage that would be expected at the lower cutoff frequency is
A)2.11 Vp- p. 
B)5.08 Vp- p. 
C)7.19 Vp- p. 
D)10.17 Vp- p.

Quizplus · Accepted Answer

At both the upper and lower cutoff frequencies of a bandpass filter, the output voltage should be the same because these frequencies represent the points at which the output power has fallen to half its mid-band value, corresponding to a voltage drop to 1/√2 (approximately 0.707) of the maximum voltage. Therefore, if the output voltage at the upper cutoff frequency is 7.19 Vp-p, it should also be 7.19 Vp-p at the lower cutoff frequency.

-Refer to the Figure Above