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Title | Image | Description | Video |
| 1 | Melde's Apparatus |
Standing Waves
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A string is help under tensions and driven by a variable frequency oscillator. Changing the frequency will change the number of modes. A strobe can be used to see the waves. |
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| 2 | Tacoma Narrows Film |
Driven Mechanical Resonance
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The "dead dog" version runs ten minutes on video disk. The film loop runs 4:40. The entire film can be purchased from
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| 3 | Chladni Plate |
Resonance in Plates, Bars, and Solids
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A square plate is clamped at its center. Sand is sprinkled on it and the place is excited with a bow. The sand will show the nodal lines of the excited pattern. The pattern will change depending on where you bow on the edge. Alternatively, the plate can be excited using a mechanical vibrator and a frequency generator as shown. |
Video |
| 4 | Hoot Tubes |
Resonance in Cavities
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Long tubes that have screen wire near one end are held over a burner. Heat until the screen is hot. The tube sounds when removed from the flame when held vertically, but stops when held horizontally. |
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| 5 | Singing Rod |
Resonance in Plates, Bars, and Solids
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A long aluminum rod will sing when it is stroked along its length with rosin and supported at its center. Find the center by balancing the rod on your finger. Rub some rosin on your free hand and vigorously stroke the rod. You will need to squeeze hard. Also try holding the rod at a point 1/3 or 1/4 of its length to excite higher harmonics. |
6. Coupled Resonators
A tuning fork is attached to resonant chamber open on one end. It is placed next to an identical setup. One of the forks is hit with a hammer and the resonance through the fork and into the air couples with the other fork's chamber, making the untouched fork resonate. That is seen by a ping pong ball suspended next to it being set into SHM.