The time between the successive crusts will give the time period of the wave.
So, the time period, T of the given wave is 0.2 s.
The frequency of a wave is the reciprocal of its time period. That is,
Frequency, ν = [tex] \frac{1}{T} [/tex]
= [tex] \frac{1}{0.2} [/tex]
= 5 Hz
Thus, the frequency of the given travelling periodic wave is 5 Hz.
