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asdf jklö

on 20 April 2013

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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
Theoretical Discussion
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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