# Resonance Problem

#### testing12

Joined Jan 30, 2011
80
A parallel resonant circuit with quality factor 120 has a resonant frequency of 6​
× 10 6 rad/s. Calculate the bandwidth and half-power frequencies.

I got Bandwidth = 50 000 rad/s

Can someone please confirm? It seems for this question the back of my txt provides answers in Farads in Henrys. Its clear there was a typo.

#### steveb

Joined Jul 3, 2008
2,436
A parallel resonant circuit with quality factor 120 has a resonant frequency of 6​
× 10 6 rad/s. Calculate the bandwidth and half-power frequencies.

I got Bandwidth = 50 000 rad/s

Can someone please confirm? It seems for this question the back of my txt provides answers in Farads in Henrys. Its clear there was a typo.

That looks correct to high accuracy, although the upper and lower frequencies are not exactly half the bandwidth away from the center frequency in general. However, for high Q systems, the upper and lower frequencies are symmetric about the resonance to very high accuracy.

#### testing12

Joined Jan 30, 2011
80
Late, but I forgot to thank you.