Question

The annoying sound from a mosquito is produced when it beats its wings at the average rate of 600. wingbeats per second. What is the frequency of the sound waves?
1/600 Hz
1/300 Hz
300 Hz
600 Hz

Answer 1

The frequency is exactly the rate at which the bug beats its wings.
If that "600" that you mentioned is 600 beats per second, then
THAT's the frequency . . . 600 per second. (600 Hz)