Explanation :
The characteristics of sound waves are as follows :
(1) Intensity : The power per unit area carried by a sound wave is called as the intensity of wave. So,
. Its unit is
.
(2) Loudness : Loudness means how the listener perceives the sound intensity. It is determined by the intensity of sound waves.
(3) Frequency : The number of to and fro oscillations of sound wave per unit time is called as its frequency. Its unit is Hz or Hertz.
(4) Pitch : Pitch means the quality of sound. It is closely related to frequency. For high pitch, the number of waves are more.