lab8 - standing wave that exhibits nodes and antinodes,...

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Jeff Trask 10/23/2007 PHY 110 A Experiment 8: Resonance in a Tube Purpose: The purpose of this lab is to experimentally determine the speed of sound using the concepts wave length and frequency. Abstract: In order to find the speed of sound, we first needed to find the wavelengths and frequencies of the various sounds we would be working with, because f v λ = where v = velocity, λ = wavelength, and f = frequency. Wavelength is defined as the distance from one point on a wave to the correlating point on the next wave (from crest to crest or trough to trough). The frequency is the measurement of the number of occurrences of an event in a certain amount of time. In order to do this, we hit a tuning fork with a known frequency to cause it to vibrate, then adjust the length of a tube (either with or without a cap on the end), until the sound resonates exactly. If the tube is closed on one end, the wavelength equals the resonating length times ¾, because the wave that is formed is a
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Unformatted text preview: standing wave that exhibits nodes and antinodes, which shorten the wavelength. If the tube is open, however, the resonating length multiplied by two is the wavelength because the wave is a standard wave that does not return from the end of the tube. We did three trials for each frequency of tuning fork and averaged them together to get the wavelength, then multiplied each by the frequency to find the velocity of sound in air. Data: See attached. Discussion: Having averaged the velocities of all our trials, the average velocity found was 359.79m/s, which is 5.73% off from the accepted value, which is 340.29m/s at sea level. The possible reasons for this discrepancy could be the fact that we are not located at sea level and that the exact resonance point was difficult to pinpoint. This lab would have been much simpler in a quiet, individual room without others around doing the same lab and making the same noise....
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