Answer:
[tex]100\text{ Hz}[/tex]Explanation:
Here, we want to get the frequency
We have the standard form of the graph as:
[tex]y\text{ = A sin(Bx+c)+ D}[/tex]where:
[tex]\text{Period = }\frac{2\pi}{B\text{ }}[/tex]In this case, B is 200pi
Thus:
[tex]\text{Period =}\frac{2\pi}{200\pi}\text{ = }\frac{1}{100}[/tex]Mathematically:
[tex]\begin{gathered} \text{Frequency = }\frac{1}{\text{Period}} \\ \\ \text{Frequency = }\frac{1}{\frac{1}{100}}\text{ = 100 Hz} \end{gathered}[/tex]