¼ Dollar "Washington Silver Quarter" specifications and ping frequencies
The ¼ Dollar "Washington Silver Quarter" is a silver coin from the United States (1932–1964), weighing 6.25 g with a diameter of 24.26 mm. Tapped gently on its edge, a genuine one is expected to ring at about 5.9 kHz, 13.9 kHz and 24.5 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 | 5919 Hz · 13925 Hz · 24514 Hz |
|---|---|
| Metal | Silver |
| Composition | 90% silver, 10% copper |
| Weight | 6.25 g |
| Fine metal content | 5.625 g |
| Diameter | 24.26 mm |
| Thickness | 1.75 mm |
| Face value | ¼ Dollar |
| Country | United States |
| Years | 1932 - 1964 |
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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