The amplitude (\(a\)) of a wave is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough ... For water waves and sound waves the unit ...

Speed\((v)\) is in metres per second \(m\,s^{-1}\), distance \((d)\) in metres \((m)\) and time\( (t)\) in seconds \((s)\). Measuring the time taken for a sound wave ...