Answer
$255Hz$
Work Step by Step
Capacitive Reactance = $X_{c}=\frac{1}{2\times pi\times f\times C}$
$X_{c}=25Ohm$, $C=25 micro-Farad$
Thus, from above equation, $f=\frac{1}{2\times 3.14\times25\times10^{-6}\times25}=255Hz$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.