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!

2 more problems with sound.

  1. Jan 21, 2006 #1
    1) An unfingered guitar string is 0.73 m long and is tuned to play E above middle C (330 Hz). (a) How from from the end of the string must a fret (and your finger) be placed to play A above middle C (440 Hz)? (b) What is the wavelength on the string of this 440-Hz wave? (c) What are the frequency and wavelength of sound in air at 20 degree's C by this fingered string? Answers: a) 0.18 m, b) 1.1 m c) 440 Hz and 0.78 m

    I am really stuck. All I can figure is that you incorporate L = v/2f.... and f = v/wavelength.... help me, please.

    2) How many overtones are present within the audible range for a 2.14-m-long organ pipe at 20 degree's if (a) it is open (b) it is closed. Answers: a) 248 overtones, 249 overtones

    What I thought you could do was v/2L and v/4L.... 343/(2 x 2.14) = 80 and 40... not correct.
  2. jcsd
  3. Jan 21, 2006 #2


    User Avatar

    Staff: Mentor

  4. Jan 22, 2006 #3
    So I would use.

    .73 m x 330 Hz = L2 x 440 Hz.

    L2 = .547 not the same as the answer 1...
  5. Jan 22, 2006 #4
    Anyone else have a suggestion?
  6. Jan 22, 2006 #5
    Can somone please help me with these problems? :( It is due soon.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: 2 more problems with sound.
  1. 2 sound wave problems (Replies: 2)

  2. 2 more basic problems (Replies: 22)

  3. More Sound Physics (Replies: 3)