Sound is something most people take for granted. Our environment is full of noises, which we have been exposed to from before birth. What is sound, how does it propagate, and how can it be quantified?

We may receive a commission on purchases made from links. There was a time, not so long ago, when most of us were perfectly content with our 32-inch CRT screens and their tinny, built-in speakers.

So far we have only considered sound in isolation and we have seen that sound has velocity, frequency, wavelength and reduces in intensity in proportion to the square of the distance from the source.