The frequency of the wave is 0.25 Hz and this can be determined by using the formula of the frequency.
Given :
A wave has a period of 4 seconds.
The frequency can be determined by using the formula of the frequency which is given by:
[tex]\rm f=\dfrac{1}{T}[/tex]
where f is the frequency and T is the time period.
Now, substitute the value of T that is 4 in the above formula of frequency.
[tex]\rm f=\dfrac{1}{4}[/tex]
Simplify the above expression in order to determine the value of 'f'.
f = 0.25 Hz
So, the frequency of the wave is 0.25 Hz.
For more information, refer to the link given below:
https://brainly.com/question/14926605
