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!

Length of wire

  1. May 23, 2008 #1
    [SOLVED] length of wire

    1. The problem statement, all variables and given/known data

    A wire of mass 1.1 g is under a tension of 100 N. If its third overtone is at a frequency of 750 Hz, calculate the length of the wire.

    3. The attempt at a solution

    v = sqrt(FL/m) = 301.5*sqrt(L)

    fn = n*v/(2*L) --> L = n*v/(2*fn) --> L = 0.36 m

    The book says 0.65 m. Am I wrong?
  2. jcsd
  3. May 23, 2008 #2

    Chi Meson

    User Avatar
    Science Advisor
    Homework Helper

    The third "overtone" is the fourth "harmonic."

    Other than that, you did everything right. (well, your final formula is incorrectly written, but you solved correctly for n=3.)
    Last edited: May 23, 2008
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Length of wire