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23 April, 15:23

A boat at anchor is rocked by waves whose crests are 28 m apart and whose speed is 7 m/s. How often do these waves reach the boat? State your answer in terms of frequency (Hz) and period T (seconds).

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  1. 23 April, 15:51
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    0.25 Hz

    4 s

    Explanation:

    Speed = wavelength * frequency

    7 m/s = 28 m * f

    f = 0.25 Hz

    Frequency = 1 / period

    0.25 Hz = 1 / T

    T = 4 s
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