5 wavs in 2 seconds = 2.5 waves per second = 2.5 Hz
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18/30 = 0.6 Hz.
20 waves per minute. (or 1 every 3 seconds)
Frequency
The frequency is 6 per 2 seconds = 3 Hz. The period is the reciprocal of the frequency = 1/3 second.
The speed of a wave = (wavelength) times (frequency) = (10) x (1/2) = 5 meters per second.