Difference between revisions of "Pipe Boundaries Video"
From UO Physics Demonstration Catalog
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Different reflections of a sound pulse traveling in an open ended tube and with the tube closed on one end. Also the speed of sound can be determined using this set-up. | |||
Using Vernier Logger Sound software, A microphone set-up at the open end of a tube with the trigger set to react to a sound pulse, A rubber stopper is set into the other end of the tube. Start the software and tap the rubber stopper. The microphone will pick up the initial pulse, as well as the reflected pulses coming out of the tube. The sequence of pulses will invert in phase since there is an inversion at the open end but not the closed end. Take out the rubber stopper and hold a larger stopper near the now opened end. Tap the large stopper and it will send a pulse down the tube. A sequence of pulse picked up by the microphone at the opposite end will now be in phase since the pulse is inverted at both open ends. | |||
'''Measuring the Speed of Sound:''' Measure the length '''L''' of the pipe and the time between pulses and calculate the speed of sound. Since it is reflected pulses coming out of the pipe, the actual distance traveled by the reflected pulse is '''2L.''' | |||
{{Video|PIPE BOUNDARIES.mp4}} | {{Video|PIPE BOUNDARIES.mp4}} | ||
Latest revision as of 16:30, 15 January 2023
Different reflections of a sound pulse traveling in an open ended tube and with the tube closed on one end. Also the speed of sound can be determined using this set-up.
Using Vernier Logger Sound software, A microphone set-up at the open end of a tube with the trigger set to react to a sound pulse, A rubber stopper is set into the other end of the tube. Start the software and tap the rubber stopper. The microphone will pick up the initial pulse, as well as the reflected pulses coming out of the tube. The sequence of pulses will invert in phase since there is an inversion at the open end but not the closed end. Take out the rubber stopper and hold a larger stopper near the now opened end. Tap the large stopper and it will send a pulse down the tube. A sequence of pulse picked up by the microphone at the opposite end will now be in phase since the pulse is inverted at both open ends.
Measuring the Speed of Sound: Measure the length L of the pipe and the time between pulses and calculate the speed of sound. Since it is reflected pulses coming out of the pipe, the actual distance traveled by the reflected pulse is 2L.
To resize, either start video and click "Fullscreen" next to the speaker icon OR right click the video and select "Open in New Tab".
