A series resonant circuit has a resistance of 1 kΩ and half-power frequencies of 10 and 90 kHz, then the bandwidth and resonant frequency of the circuit, respectively, are:
1
9 kHz and 40 kHz
2
80 kHz and 30 kHz
3
40 kHz and 10 kHz
4
80 kHz and 9 kHz