Question

On a hot summer day, a little mosquito produces warning sound near your ear at a rate of about 3000 wings beat per five second .what is the frequency, in heartz, of this sound? (Heartz=1/second)

Answer 1

number of wings beat in 5 second = 3000
number of wings beat in 1 second = 3000/5 = 600
So frequency is 600Hz.

Answer 2

Frequency of the sound generated by the beating of the wings of a mosquito is
   3,000 / 5 seconds
  =  6 00 / sec  = 600 Hz or Hertz