Question

ITT LUU UU.) VIIY 15 le fundamental frequency of the closed tube lower than it was for the open tube? 2. Increase the frequency and try to find any other harmonics. Why does a tube open at both ends play all the harmonics, but a tube with one end closed only plays the odd harmonics (1, 3, 5, etc.). What is the relationship between the tube length and the wavelength for the third harmonic of a closed tube? QUESTIONS 1. In a pipe organ: (a) Which pipes make the low notes, the long ones or the short ones? (b) Which pipes sound the lower frequency, the long ones or the short ones? (c) Which pipes sound the longer wavelengths, the long ones or the short ones? 2. Suppose that in this experiment the temperature of the room had been lower, what effect would this have had on the distance between nodes for each reading? Explain. 3. How would an atmosphere of helium affect the pitch of an organ pipe? CONCLUSION Summarize the differences between an open and closed tube. Also discuss: -How the velocity, wavelength, and frequency changed as the tube length was varied. -How the velocity, wavelength, and frequency changed for the part of the experiment in which the tube length was constant.

Answer 1

Q1 For a pipe open at one end only, the frequency is given by: е по fn - AL Part a: The low notes are for the lowest frequency, then I must be larger. Part b: For lower frequency, L must be larger. Part c: The wavelength is: v 4L 2 = = f n For longer wavelength, L must be greater. |