(a) What is ultrasound ? What is the difference between ordinary sound and ultrasound ?
(b) Write any three applications (or uses) of ultrasound.
(a) What is meant by the (a) 'pitch' of sound, and (b) 'quality' of sound?
(b) What is ultrasound? State two uses of ultrasound.
Sonar makes use of:
(a) infrasonic sound
(b) ultrasound
(c) ordinary sound
(d) light.