Half Dollar Kennedy specifications and ping frequencies
The Half Dollar Kennedy is a silver coin from the United States (1965–1970), weighing 11.5 g with a diameter of 30.61 mm. Tapped gently on its edge, a genuine one is expected to ring at about 5.7 kHz, 13.0 kHz and 23.4 kHz: its first resonance frequencies, set by its metal, size and thickness. A counterfeit made of a different metal, or with a different weight or thickness, rings at different frequencies, which is what the ping test above checks.
| Ping test reference frequencies | 5717 Hz · 12990 Hz · 23378 Hz |
|---|---|
| Metal | Silver |
| Composition | 40% silver, 60% copper |
| Weight | 11.5 g |
| Fine metal content | 4.600 g |
| Diameter | 30.61 mm |
| Thickness | 2.15 mm |
| Face value | ½ Dollar |
| Country | United States |
| Years | 1965 - 1970 |
These reference frequencies are predicted by our resonance model from the coin’s weight, size and metal, and not yet confirmed with recordings. Compare with the ping frequencies of every supported coin.
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