ULTRASONIC WAVES -- THEORY OF ULTRASONIC WAVES
Waves in nature are of two types, Mechanical and Electromagnetic. Mechanical waves are longitudinal in nature and require a medium for its's propagation. Electromagnetic waves are transverse in nature and do not requires a material medium for their propagation. Sound waves are mechanical in nature.
Sound waves are classified according to the frequency range. Sound waves having frequency less than 20 Hz are known as infrasonic waves. Waves having frequency between 20 Hz and 20000 Hz lie in audible sound. Sound waves having frequency higher than human audible range or sound waves having frequency above 20 Hz are known as Ultrasonic waves or Supersonic Waves.
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