Physics 22 Lab 2

# Physics 22 Lab 2 - Jeffrey Birenbaum Physics 22 Lab Lab:...

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Jeffrey Birenbaum Physics 22 Lab Lab: Standing Waves 9/25/11 Introduction: In the second lab of this semester, we did two different set-ups to illustrate the idea of standing waves. Each trial tested a different dynamic of standing waves; we started with a string vibrator, function generator, and string to measure the wavelength of the fundamental and first six harmonics after that. This was used to calculate the mass per unit length, an important quality of string. Then, we tested standing waves in a column of air by finding the different points (nodes) when the pitch of sound coming from the column was the highest. This data was then used to calculate the speed of sound. Standing Waves on a String Procedure: First, we set up the situation using a weight, string, notched bridge, function generator, string vibrator, and pulley. The notched bridge was placed 10 cm from the pulley and the wait was hung below the pulley to produce tension. Then, we conducted each trial according to the specifications (different mass, etc…). To find each piece of data, the frequency was slowly increased (in the 1-100 range) until nodes were clearly visible in the string. Each nodes frequency was then recorded up to the 6 th harmonic. The string was also measured and weighed to determine what piece of the string was actually being affected by the waves. Two different masses were used in this section. Standing Waves in a Column of Air Procedure: First, we set up the situation using an air column, a piston, and a speaker. The piston was placed inside the tube at the opposite side of the speaker. We then tried to find each node, pulling the piston farther out to find when the pitch of sound was the stronger. We set the frequency at 497 Hz for each trial and then 827 Hz for the second trial. Then, the amount of

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## This note was uploaded on 11/17/2011 for the course PHYSICS 2012 taught by Professor Franklee during the Fall '11 term at GWU.

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Physics 22 Lab 2 - Jeffrey Birenbaum Physics 22 Lab Lab:...

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