Longitudinal Standing Waves antinodes (max. vibration) nodes (no vibration)
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Transcript of Longitudinal Standing Waves antinodes (max. vibration) nodes (no vibration)
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Longitudinal Standing Waves
antinodes (max. vibration)
nodes (no vibration)
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Wind instruments create sound through standing waves in a column of air.
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Remember, this is a longitudinal wave
even though we draw it like this to
visualize the shape.
When air is blown over a bottle, it creates a standing longitudinal (sound) wave
open end: antinode
vibrating air molecules
closed end: node
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You can also ring a tuning fork over a
bottle or tube, and if it creates wavelengths of just the right length, you’ll
get a standing wave (loud
sound).
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Just like we did for strings, we can also derive a
formula to calculate……
f nv
4Ln
n = 1,3,5,…
The Harmonic Frequencies for a tube open at one end
speed of sound
odd harmonics only
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Standing waves can also occur
in a tube that is
open at both ends
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f nv
2Ln
n = 1,2,3,4,…
Harmonic Frequencies for a tube open at both ends
Web Link: Flute
A tube open at both ends has displacement antinodes, at the ends.
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Resonance Lab – 3.1 pRACTISE
AIM To determine the speed of sound by means of a resonance tube.
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