week 13a

# week 13a - A/V Test Slide Brass Woodwinds Physics 1240...

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A/V Test Slide

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Physics 1240, Thursday, April 7, 2011
• Important Dates • Exam • Standing waves in pipes – Open at both ends – Closed at one end – Conical – Strangeness in some brass instruments • Mouthpieces and Reeds • Tone Holes, Valves, Slides and Register Keys

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April 7 14 21 28 8 15 22 29 9 16 23 30 5 12 19 26 3 4 11 18 25 2 3 10 17 24 1 6 13 20 27 CAPA #8 Homelab #3 Final Exam 4:30 - 7 PM
Exam

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Bassoon Clarinet Alto Saxophone Oboe English Horn Flute
Standing Waves in Pipes A pipe is a container into which we can “pack” high amplitude pressure fluctuations Compression Rarefaction

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Standing Waves in Pipes Each air parcel wiggles back and forth about its equilibrium position Longitudinal Wave Propagation Displacement
Standing Waves in Pipes Standing wave is a superposition of the “forward” wave and the reflected wave Snapshot 1 Snapshot 2 Snapshot 3

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Standing Waves in Pipes Pressure fluctuation has nodes at ends Displacement has antinodes at ends Pressure Fluctuation Displacement
Standing Waves in Pipes Pipe with two open ends has all harmonics present Pressure Fluctuation ! = 2 L ! = L ! = 2/3 L f = v / ( 2 L ) = f 1 f = v / L = 2 f 1 f = v / ( 2/3 L ) = 3 f 1

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## This note was uploaded on 05/01/2011 for the course PHYS 1240 taught by Professor Holland,murray during the Spring '08 term at Colorado.

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week 13a - A/V Test Slide Brass Woodwinds Physics 1240...

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