Have you ever seen waves anywhere other than in water?
Amplitude, wavelength and period
To help measure the amount of energy in a wave, scientists make different measurements, which are shown in the
diagram. If you think of the diagram as a picture of waves on the water, the straight horizontal line represents the
water when it is perfectly still.
Peaks (or crests) are the highest points above the fl at water line.
Troughs are the lowest points below the fl at water line.
The amplitude of the wave is how high it is above the fl at water
line (or how low it is below the fl at water line).
The wavelength is the distance from peak to peak, or trough to
trough.
The period of the wave is the length of time from when one peak
passes a point to when another peak passes the same point.