1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Speed of waves

  1. Nov 7, 2007 #1
    1. The problem statement, all variables and given/known data

    The wavelength of a water wave is 8.0m and its speed is 2.0m/s. How many waves will pass a pixed point in the water in 1.0min?

    2. Relevant equations

    V =f(lambda)

    3. The attempt at a solution

    As far as I got was that 1.0 min = 60 seconds. From there, I am totally lost.
     
  2. jcsd
  3. Nov 7, 2007 #2

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Frequency measures the number of waves that pass a fixed point per unit time. Does that help any?
     
  4. Nov 7, 2007 #3
    F = 1/T, which is all I know.
     
  5. Nov 7, 2007 #4

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Well if you can work out the frequency which tells you how many waves pass a point per second then you can use that to work out how many waves pass in a certain number of seconds.
     
  6. Nov 7, 2007 #5
    I get confused as to how to know which number to use for the denominator.
     
  7. Nov 7, 2007 #6

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    What is the frequency first of all?
     
  8. Nov 7, 2007 #7
    F = 1/T
    T = P = 8.0m / 2.0s = 4s

    F = 1/4
     
  9. Nov 7, 2007 #8

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    so if one quarter of a wave passes a fixed point every second, how many pass that fixed point in 60 seconds?
     
  10. Nov 7, 2007 #9
    60/4
    = 15 waves in 60 seconds.
     
  11. Nov 7, 2007 #10

    Kurdt

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    That looks fine to me.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Speed of waves
  1. Speed of Wave (Replies: 7)

  2. Wave speed (Replies: 1)

  3. Wave speed (Replies: 4)

  4. Speed of a Wave (Replies: 3)

  5. Speed of wave (Replies: 6)

Loading...