This time interval is known as the period of the wave. The period of a wave is the time it takes for one complete cycle of the wave to pass a certain point. In this case, the water wave goes from the equilibrium level to the crest and back to the equilibrium level in 0.16s.
The frequency of a wave is the number of complete cycles of the wave that pass a certain point per unit time. The frequency can be calculated using the following formula:
Frequency = 1 / Period
In this case, the period of the wave is 0.16s. Therefore, the frequency of the wave is:
Frequency = 1 / 0.16s
Frequency = 6.25 Hz
So, the water wave has a frequency of 6.25 Hz, meaning that 6.25 complete cycles of the wave pass a certain point per second.
The time needed for a water wave to change from the equilibrium level to the crest is 0.16 s.
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