1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Finding the possible frequencies of a tuning fork

  1. Nov 23, 2009 #1
    1. The problem statement, all variables and given/known data

    A 0.0120 kg, 2.05 m long wire is fixed at both ends and vibrates in its simplest mode under a tension of 202 N. When a tuning fork is placed near the wire, a beat frequency of 5.10 Hz is heard. What are the possible frequencies of the tuning fork? (enter the smaller frequency first) (It asks for 2 answers)

    2. Relevant equations

    f = √(TL/m)/2L
    fb = |f1 - f2|

    3. The attempt at a solution

    I first found the frequency of the string using equation 1 then I simply thought that the frequency of the tuning fork would always be multiples of 5.10 Hz from the frequency of the fork. So i got answers like 50.4, 50.5...

    Can anyone please help out?
  2. jcsd
  3. Nov 23, 2009 #2
    Just use the second equation you listed in section 2. you know [itex] f_b [/itex] and [itex] f_1 [/itex] so what can [itex] f_2 [/itex] be?
  4. Nov 23, 2009 #3
    I end up getting 50.4 and 55.5 Hz, which is wrong.
  5. Nov 23, 2009 #4


    User Avatar
    Homework Helper

    f - 5.1 and f + 5.1
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook