Amplitude: The height or size of a wave. Measured in metres.
Crest: The highest point of the wave.
Diffraction: When a wave is bent and spread as it passes around an edge or through a gap.
Frequency: The number of waves in a certain time period.
Longitudinal: A wave that oscillates parallel to the direction of travel (e.g. sound waves)
Transverse: A wave that oscillates perpendicular to the direction of travel (e.g. waves on the electromagnetic spectrum)
Trough: The lowest point of the wave.
Wavelength: The distance between the crests of two waves, the length of one wave.
Wave period: The length of time it takes for one wave to be completed.
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Section 4 b) Summary
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