1) 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 wave?

Question

1/600
1/300
300
600

My answer was 1/600 but this was wrong.

Answer 1

Definition:
Frequency is the number of occurrence of a repeating event per unit time.

See if you would make a different choice.

Answer 2

600