28. A girl in a stationary boat observes that 10 wave crests pass the boat every minute. What is the period of the water waves? \begin{enumerate} \item $\frac{1}{10}$ min \item $\frac{1}{10}$ min$^{-1}$ \item 10 min \item 10 min$^{-1}$ \end{enumerate} [1 mark]
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This means that one wave crest passes the boat every 1/10th of a minute, or every 6 seconds. Show more…
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