Final answer:
The resonant frequency of the RF amplifier is 32.5 Hz.
Step-by-step explanation:
The resonant frequency of an RF amplifier can be calculated using the formula:
Resonant frequency (in kHz) = Bandwidth (in kHz) / Q factor.
Given that the Q factor of the amplifier is 123 and the bandwidth is 4 kHz, we can substitute these values into the formula:
Resonant frequency = 4 kHz / 123 = 0.0325 kHz = 32.5 Hz.
Therefore, the resonant frequency of the RF amplifier is 32.5 Hz.