How often the particles vibrate about their fix position"
O
Amplitude
O
Frequency
O
Period
Speed
0
Wavelenght

As an example, a wave with a period T = 0.25 s takes ¼ of a second to complete a full vibration cycle (crest - trough - crest) at a certain location and thus performs four vibrations per second. Hence its frequency is f = 4 Hz.

Explanation:

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