Pipe - Natural frequency Resonance Very large increase in...

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Liu UCD Phy9B 07 7 16-4. Standing Sound Waves Open end: always a pressure node (or a displacement antinode), since there is no pressure change Displacement node: where particles have zero displacement antinode: max Pressure node: where pressure change is zero antinode: max Displacement node = Pressure antinode Displacement antinode = Pressure node
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Liu UCD Phy9B 07 8 Open pipe Closed pipe 1 2 nf L nv f n = = 1 4 nf L nv f n = = n =1,2,3,4… n =1,3,5… Both ends are Pressure nodes – no pressure difference Displacement antinodes 2 Open end: displacement antinodes Closed end: displacement node
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Liu UCD Phy9B 07 9 16-5. Resonance m k f π 2 1 0 = Intrinsic Recall simple harmonic oscillator
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Unformatted text preview: Natural frequency Resonance: Very large increase in oscillation amplitude when f=f Liu UCD Phy9B 07 10 Resonance When the driving frequency equals a normal mode frequency of the system, energy will be added into the system and increase the oscillation amplitude. Liu UCD Phy9B 07 11 16-6. Interference of Waves Path difference λ /2, 3 λ /2, 5 λ /2… Destructive interference 0, λ, 2λ, 3λ. .. Constructive interference Liu UCD Phy9B 07 12 16-7. Beats Beats: Periodic amplitude variations caused by two waves with slightly different frequencies. Beat frequency: f beat = |f a-f b |...
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This note was uploaded on 02/17/2009 for the course PHY na taught by Professor Richardscalettar during the Spring '09 term at UC Davis.

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Pipe - Natural frequency Resonance Very large increase in...

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