Answer the following questions related to the different ranges of sound frequencies heard (or not heard) by humans.
(a) Define the terms (i) audible sound, (ii) infrasound and (iii) ultrasound.
(b) State the approximate frequency limits that separate these three ranges.
(c) Draw a neat, labelled linear frequency scale from 0 Hz to 40 kHz. Mark clearly the boundaries between the three ranges and write one example source for each range on the scale.