Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 12 - Sound - General Problems - Page 357: 83

Answer

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Work Step by Step

We use the effective length of the tube. $$\ell_{eff}=\ell+\frac{1}{3}D=0.55m+\frac{1}{3}0.030m=0.56m$$ Use the equation for the fundamental frequency of a tube closed at one end,. See figure 12-12. First harmonic, first uncorrected, then taking the end correction into consideration $$f=\frac{v}{4L}=\frac{343m/s}{4(0.55m)}=156Hz$$ $$f=\frac{v}{4L}=\frac{343m/s}{4(0.56m)}=153Hz\approx 150Hz$$ Second harmonic, first uncorrected, then taking the end correction into consideration $$f=\frac{3v}{4L}=\frac{3(343m/s)}{4(0.55m)}=468Hz$$ $$f=\frac{3v}{4L}=\frac{3(343m/s)}{4(0.56m)}=459Hz\approx 460Hz$$ Third harmonic, first uncorrected, then taking the end correction into consideration $$f=\frac{5v}{4L}=\frac{5(343m/s)}{4(0.55m)}=780Hz$$ $$f=\frac{5v}{4L}=\frac{5(343m/s)}{4(0.56m)}=766Hz\approx 770Hz$$ Fourth harmonic, first uncorrected, then taking the end correction into consideration $$f=\frac{7v}{4L}=\frac{7(343m/s)}{4(0.55m)}=1091Hz$$ $$f=\frac{7v}{4L}=\frac{7(343m/s)}{4(0.56m)}=1072Hz\approx 1100Hz$$
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