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Definition of Wavelength:
The wavelength of a wave is the length of the wave or repeating wave segment. It is often (but not always) measured as the distance from crest to crest.
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A wave involves the repeating and periodic vibration of a medium in a regular fashion. As each particle of the medium undergoes its up and down (or back and forth) vibration, the familiar wavelike pattern is established in the medium. Within the pattern, there is a repeating element that reoccurs over and over. The length of this repeating pattern is known as the wavelength.
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