Draw a labelled diagram to show the multiple reflections of sound in apart of the stethoscope tube.

Explain how, flaws (or defects) in a metal block can be detected by using ultrasound.

Why are the ceilings of concert halls made curved? Draw a labelled diagram to illustrate your answer.

What is the range of frequencies associated with

(a) infrasound

(b) audible sound, and range of the frequeny

What is the difference between infrasonic waves and ultrasonic waves?