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the displacement from the rest position to the crest (not from the trough to the crest)
the length of a full cycle of the wave e.g. from crest to crest.
the number of complete waves passing a certain point per second or the number of waves produced by a source each second
measurement for frequency
waves the vibrations are perpendicular (at 90 degrees) to the direction of energy transfer of the wave.
Examples of transverse waves
1. Light and other EM waves
the vibrations are parallel to the direction of energy transfer
symbol for wave length
examples of longitudinal waves
Sound waves and ultrasound. Shock waves e.g. seismic waves. Slinky spring when you push the end