Answer :
ANSWER:
4th option: 0.0725 Hz
STEP-BY-STEP EXPLANATION:
Given:
Period (T) = 13.8 s
We can calculate the frequency using the following formula:
[tex]\begin{gathered} f=\frac{1}{T} \\ \\ \text{ We replacing:} \\ \\ f=\frac{1}{13.8}=0.0725\text{ Hz} \end{gathered}[/tex]The frequency of the wave is 0.0725 Hz, therefore, the correct answer is 4th option: 0.0725 Hz