PIRA 3B80.10 Resonance Tube
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Instructions:
- Ensure that the nail support is not fixed to the post.
- Tie the string to the mass, and lower the mass into the tube.
- Strike the tuning fork and hold it at the lower end of the tube.
- The mass acts as a closed end for the tube, so the length of the tube can be adjusted by changing the height of the mass. At specific lengths of the tube, resonance will occur for the chosen frequency. The length of the tube is measured starting from the bottom.
| Frequency (Hz) |
Theoretical 1st resonance length (mm) |
Observed 1st resonance length (mm) |
| 384 |
223.307 |
225 ± 1mm |
| 440 |
194.886 |
170 ± 1mm |
| 512 |
176.480 |
166 ± 1mm |
Concept Conveyed:
- Fundamental frequencies; Constructive interference occurs at every
quarter wavelength of the sound wave (this can be observed by an increase in amplitude of the
sound) when the wave is reflected from the closed end of the tube.
Picture shows demonstration used at the University
of Texas at Austin
Last Updated 2024 - University of Texas at Austin Physics Department - All Rights Reserved.
