Longitudinal Standing Waves antinodes (max. vibration) nodes (no vibration)

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Presentation transcript:

Longitudinal Standing Waves antinodes (max. vibration) nodes (no vibration)

Wind instruments create sound through standing waves in a column of air.

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

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).

Just like we did for strings, we can also derive a formula to calculate…… n = 1,3,5,… The Harmonic Frequencies for a tube open at one end speed of sound odd harmonics only

Standing waves can also occur in a tube that is open at both ends

n = 1,2,3,4,… Harmonic Frequencies for a tube open at both ends Web Link: FluteFlute A tube open at both ends has displacement antinodes, at the ends.

Resonance Lab – 3.1 pRACTISE AIMTo determine the speed of sound by means of a resonance tube.