Question
Find the frequency of a tuning fork that takes 2.50×103 s2.50 \times 10^{-3} \textrm{ s} to complete one oscillation.
Question by OpenStax is licensed under CC BY 4.0
Final Answer

400 Hz400 \textrm{ Hz}

Solution video

OpenStax College Physics, Chapter 16, Problem 9 (Problems & Exercises)

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Video Transcript
This is College Physics Answers with Shaun Dychko. Frequency is the reciprocal of period, so we're told that the tuning fork takes two and a half milliseconds or two and a half times ten to the minus three seconds to do one oscillation. So one divided by that gives 400 Hertz as the frequency.