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guns

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Transcript of guns

Method content Problem Helmholtz Carousel Table of Set-up & Results Variables Discussion Conclusion Attach Christmas tree balls on a low friction mounting (carousel) such that the hole in each ball points in a tangential direction. If you expose this arrangement to sound of a suitable frequency and intensity, the carousel starts to rotate. Explain this phenomenon and investigate the parameters that result in the maximum rotation speed of the carousel. Method
Set-up
Variables
Results
Theoretical Discussion
Conclusion
References Volume of resonator
Sound level Measure the Resonance frequency
Cut a hole into the bottom of the resonator.
Put in the microphone.
Try out different frequencies until Resonance frequency is determined.
Attach resonators to the Set-up.
Adjust the frequency in the generator to the Resonance frequency. References Vöslauer 500 ml
f = 208 Hz
medium bottle spacing = 235 +- 2 mm
Bottle m = 23.7 g
Wood strip L = 251 mm ; m = 8.0 g
Total mass: 60.3 g
Diameter = 65 +- 2 mm
Length L = 170 mm
Neck length = 30 mm Almdudlerbottle 500 ml
f = 184 Hz
medium bottle spacing = 215 +- 2 mm
Bottle m = 22.4 g
Wood strip L = 282 mm ; m = 9.0 g
Total mass: 60.1 g
Diameter D = 65 +- 2 mm
Length L = 170 mm
Necklength = 55 mm Vöslauer 1l
f = 154 Hz
medium bottle spacing = 235 +- 2 mm
Bottle m = 28.6 g
Wood strip m = 8.0 g & 250mmx15mmx4mm
Diameter D = 95 +- 2 mm
Length L = 160 mm
Necklength = 30 mm Relevant Variables
Volume of Resonator
Sound level
According to the theoretical approach the variables prove to be relevant for the problem L. Bergmann – Cl. SchaeferLehrbuch der ExperimentalphysikBand I (Mechanik, Akustik, Wärmelehre), 7.Auflage
Am. J. Phy. 60(8), 722(1992)
J. Acoust. Soc. Am., Vol. 57(6), 1533(1975)
Alejandro JenkinsIrreversibility in an ideal fluidarXiv:1301.3915 [physics.flu-dyn]
www.phys.unsw.edu.au/jw/Helmholtz.html Resonance curve of 500ml water bottle p 0 p 0 p + = x V Volume: „Resonator Spring“
A Neck Area
L Neck Length
"rho" Air Density
m="rho"·A·L „Resonator Mass“
p Air Pressure 0 H Resonance curve of 500ml "Almdudler" bottle Combined graph for specific sound level Combined graph for air friction
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