Answer: The frequency of the wave is 0.02 Hertz.
Step-by-step explanation:
Frequency is a parameters which describe a wave. This is defined as the number of oscillations happening per unit second.
Mathematically,

In the question,
Number of oscillations happening per second = 50
Putting this value in above equation, we get:

Hence, the frequency of the wave is 0.02 Hertz.