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Homework Help: Speed of Ocean Waves

  1. May 14, 2010 #1
    1. The problem statement, all variables and given/known data
    Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?

    3. The attempt at a solution

    [tex]\lambda = 120[/tex]

    They are coming in at a rate of 8 per minute, that is 8 in 60 seconds. So the period is

    [tex]T=\frac{8}{60}=0.13[/tex]

    Now we find frequency

    [tex]f=\frac{1}{T}=\frac{1}{0.13}=7.5[/tex]

    [tex]v=f \lambda = 120 \times 7.5=900[/tex]

    But this is wrong. It is far larger than the actual answer! What did I do wrong?
     
  2. jcsd
  3. May 14, 2010 #2

    rock.freak667

    User Avatar
    Homework Helper

    8 per minute would be the frequency, not the periodic time I believe.
     
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