The frequency of the wave is 0.2 Hz.
How do you calculate the frequency of a wave?
The frequency of a wave is given by the equations:
[tex]f=\frac{1}{t}[/tex]
⇒ f is the frequency of the wave in hertz.
⇒ t is the period of the wave in seconds.
By applying the formula, we get:
t = 20 s ...given
[tex]f=\frac{1}{t}\\f=\frac{4}{20}[/tex]
f = 0.2
Wave frequency is the number of waves that pass a fixed point in a given amount of time. The SI unit for wave frequency is the hertz (Hz).
Learn more about Wave frequency here: brainly.com/question/25699025
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