The distance from one wave to the next wave is called the
wavelength.
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The speed of a wave is how far the wave travels in one unit of time.
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1) Crest of one wave meets the crest of other wave
OR
Trough of one wave meets the trough of other wave.
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The period of a wave is defined as the time taken by a wave to
complete one oscillation. While, the frequency of a wave is defined
as the number of oscillations completed by a wave in one
second.