# What property of a wave describes how often it occurs?

What property of a wave describes how often it occurs?
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Kelbelol
Frequency describes the number of times the wave cycles every second. If the wave was produced by a mechanical source (like a sound wave) this is also the frequency of oscillation of the source.
So, it makes sense to speak of the frequency of vibration of a guitar string for example, and also of the frequency of the particular sound it produces. This frequency produces the familiar characteristic we call the pitch of the sound.