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Hw help please

Discussion in 'Pre-Medical - MD' started by Sherif, Apr 19, 2004.

  1. Sherif

    Sherif Hot stuff
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    A 75 cm string is stretched between 2 fixed supports. it has resonant frequencies of 420 Hz and 315 Hz with no other resonant frequencies between those two.

    A. What is the lowest frequency for this string. I got 180Hz
    B. What is the speed of a wave on this string. I got 270 m/s

    Did i even do them right, if not can you tell me how? Thanks
     
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  3. Brickhouse

    7+ Year Member

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    Do your own homework, young man!
     
  4. Sherif

    Sherif Hot stuff
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    I did it, that's why there are answers. I am just not sure
     
  5. IcedCube

    IcedCube Senior Member
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    a.
    n(wavelength/2)=L
    fn=n*f1
    fn+1=(n+1)*f1

    set both sides equal to f1, solve for n, then f1.


    b. v=wavelength * frequency

    you have frequency from above.

    to find wavelength, n(wavelength/2)=L (meters)


    btw, ur answers are wrong
     

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