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Math Help - Verify Physics Question

  1. #1
    Senior Member sakonpure6's Avatar
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    Verify Physics Question

    If a third harmonic is generated on a guitar string, so that the sound produced in air has a wavelength of 3.47m, what is the length of the string? Assume the speed of waves on the guitar's string is 500 m/s and in air is 334m/s.
    First of all, I do not think that the speed of the sound in air matters, and I just used the formula Length= n*(wave length)/2, so L=3(3.47)/2 = about 5m. Now this is very unrealistic. So what do you think??

    Thank you for your time.
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  2. #2
    MHF Contributor

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    Re: Verify Physics Question

    Yes, you do need the speed of sound. The wavelength in air is NOT the wavelength in the string. What is true is that the frequency in air is the same as the frequency in string.
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  3. #3
    Senior Member sakonpure6's Avatar
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    Re: Verify Physics Question

    Quote Originally Posted by HallsofIvy View Post
    Yes, you do need the speed of sound. The wavelength in air is NOT the wavelength in the string. What is true is that the frequency in air is the same as the frequency in string.
    OOOOOOOOOOOOOOOOOOOOOOOOOOOHHHHHHHHHHHHHHHHHHHHH thank you!!!!!!!!!!!
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