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Topic: Velocity and Pitch with Twirly Tunes (Read 6282 times)
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Vernier Forum Admin
Administrator
Full Member
Posts: 108
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Posted on: 2002-06-26 13:37:00 by Kristen Elsner
I have been considering conducting an experiment where the pitch of sound produced in a twirly tune (flexible sound pipe)is measured versus the velocity of spin, and also the pressure at the antinode(Bernoulli). Is this too complicated of a senario? I intended to fix a microphone above the area of spin, attach a gas pressure probe to the opening and measure velocity as the end of hte tube passes through a photogate. Comments, advice and words of wisdom would be nice.
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phil
Newbie
Posts: 1
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Hello. I have struggled with being able to design an experiment on the Doppler effect. Have you gotten any replies?
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garyb
Newbie
Posts: 2
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use the video synch feature of logger pro to measure the spin rate
fourier fast transform(FFT) can match the key frequency with spin value
a subsequent graph can plot the different spin rates with frequency to predict further spin and frequency
the limit will be the length of the pipe and the rate at which it can be spun
vertical spin will allow 'straight on' view for the video camera( or use a macbook with buit in camera-works well!!)
as an added bonus using the mabook...make a podcast of it (on the fly) and have as a learning object for others to view
regards
gary
melbourne
australia
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Roland Stout
Newbie
Posts: 1
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Doppler Effect
We are blest/cursed (take your pick) to have a major rail line 50 m in front of our building. After reading this post, I took 3 LabQuests, two with microphones and one with a motion sensor probes and stood about 7 m away from the track and recored the motion for 10 s as the train approached. A student with me then recored the sound of the train's horn for 0.5 s as it approached with one LabQuest and I recorded 0.5 s of sound with the other one after the train passed us.
The motion sensor gave the velocity of the train, and Fourier analysis of the two sound recordings gave the fundamental frequency of the train's horn as it approached and then passed us. The Doppler shift proved to be quite close to what was expected.
This required some juggling of the labQuests
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