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!

Waves Question - Flute

  1. Nov 21, 2007 #1
    1. The problem statement, all variables and given/known data

    Aa flutists assembles her flute in a room where the speed of sound is 342 m/s. When she plays the note A, it is in perfect tune with a 440 Hz tuning fork. After a few minutes, the air inside her flute has warmed to where the speed of sound is 346 m/s.
    A) How many beats per second will she hear if she now plays the note A as the tuning fork is sounded?
    B) How far does she need to extend the "tuning joint" of her flute to be in tune with the tuning fork?

    2. Relevant equations

    For an open-open tube:

    [tex]\lambda[/tex]_m = 2L/m
    f_m = mv/2L

    3. The attempt at a solution

    I found the answer for A to be 5 beats/second, but I can't seem to figure out how to calculate B. I tried subbing in f = 440 Hz and v = 346 m/s into the second equation with m=1 but it wasn't the right answer. I know the answer is 4.6 mm but I don't know how they get that. Any help is appreciated!!
     
  2. jcsd
  3. Nov 22, 2007 #2

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    This is correct.

    That will give you the length required to produce the correct A note at the higher temperature. You are asked for the extension, which is the difference between the lengths at the high temperature and the low temperature.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Waves Question - Flute
  1. Wave question (Replies: 1)

  2. Waves question (Replies: 1)

  3. Wave Question (Replies: 6)

  4. Waves Question (Replies: 1)

  5. Waves question (Replies: 6)

Loading...