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Math Help - crests period, frequency, wavelength..

  1. #1
    Senior Member
    Joined
    Jan 2007
    Posts
    476

    crests period, frequency, wavelength..

    A woman is standing in the ocean, and she notices that after a wave crest passes, five more crests pass in a time of 62.0 s. The distance between two consecutive crests is 36 m. Determine, if possible, the following properties of the wave.

    need to find these:

    period s
    frequency Hz
    wavelength m
    speed m/s
    amplitude m


    also, not sure why the speed is not .5806 m/s, maybe i'm not doing this right. meters/seconds?

    and i know that the frequency formula is: 1/T

    not sure on the calculation for the period.

    anyone who can work some of this out please.
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  2. #2
    coolchicken71
    Guest
    The period is the time between crests - there are 5 crests over 62 s, so the period is 62/5.

    The frequency is the inverse of the period - 5/62.

    The wavelength is the length between crests, which is given as 36 m.

    The speed is wavelength / period - 36 / (62 / 5).

    The amplitude is how tall each crest is, but that data is not given and we cannot calculate it from the other given values.

    CC
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  3. #3
    Senior Member
    Joined
    Jan 2007
    Posts
    476
    Okay i see now with the speed, i was calculating it wrong my m/s it is Wavelength / period. Thanks very much for these, now i won't get the formula equations messed up I was using. Appreciate this very much.

    I got: period 12.4 s
    frequency .081 Hz
    wavelength 36 m
    speed 2.9 m/s

    and I was trying to calculate this, but that is correct, its not possible from what we have.
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