The frequency is the number of vibrations in 1 second, so just divide 20/2.5 = 8 vib/sec .
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0.5 Hz (that is, 0.5 persecond)
If one wave completes, or passes a point, every 8 seconds, then the frequency is 1/8 Hz. = 0.125. The dimensions have nothing to do with the frequency.
The frequency of a wave can be calculated using the formula f = 1/T, where f represents frequency and T represents period. In this case, with a period of 6 seconds, the frequency would be f = 1/6 = 0.1667 Hz. This means that the wave completes 0.1667 cycles in one second.
Assuming that seconds refers to the period, the frequency is the reciprocal (1 / period in seconds). The height of the wave is irrelevant in this case.
Period = 1/78.6 seconds = 0.01272 seconds