Sonar makes use of:
(a) infrasonic sound
(b) ultrasound
(c) ordinary sound
(d) light.
In SONAR we use :
(a) ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves
What is : periodic time, simple harmonic motion , wave, wave length, amplitude, frequency, wave velocity, audible sound, infrasonic sound, ultrasonic sound, echo and reverberation
