Determining Resonance of Rods for a Given Frequency

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The discussion focuses on the resonance of metal rods and how they can be tuned to specific frequencies, such as 256 Hz. Participants explore the phenomenon where one resonating object can induce resonance in another nearby object, similar to tuning forks. There is a query about determining the physical specifications, like length and thickness, required for a rod to resonate at a desired frequency. One contributor suggests that the plastic knobs on the rods may primarily serve as visual aids to make the vibrations more observable. The conversation highlights the interest in understanding the relationship between rod dimensions and their resonant frequencies.
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Most of us have seen the experiment where a tuning fork that is resonating, makes another tuning fork resonant when brought close in proximity.

Theres another one where small metal rods are mounted upright with plastic knobs on top (dont know if this is necessary), and two rods of same length, etc will resonate together in the same way.

Does anyone know how, with such a rod, to determine the specifications for a rod for a certain frequency?
say for 256 hz for example, how long, thick.. etc...

Much appreciated!
 
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I don't know the answer to your question, but I suspect that the plastic knobs are simply a visual aid. It's hard to see a rod vibrating, but it's easy to see a coloured sphere moving back and forth.
 

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