Final answer:
The period, frequency, and speed are essential concepts in understanding waves.
Explanation:
Period: the time it takes for two successive crests to pass a given point.
Frequency: the number of waves passing a point in a given amount of time, usually expressed as waves per second. This is the inverse of the period.
Speed: how fast the wave travels, or the distance traveled per unit of time. This is also called celerity (c).
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