• Background
  • Instructions
  • Illustration
  • Quiz

Background

The frequency of a sound stimulus refers to the number of cycles in the sound wave that occur in 1 second. The perceptual correlate of frequency is pitch. Tones that have low frequencies are heard as being low in pitch, whereas tones that have high frequencies are heard as high in pitch. We define frequency as the number of cycles in a sound stimulus that occur in 1 second. Pitch is the subjective experience of sound that is most closely associated with the frequency of a sound stimulus.

In this illustration, you can play one octave of a piano keyboard and both hear the tone and see its frequency. This keybaord will only play a pure tone that is associated with the pitch of each key on the piano starting at middle C.