There are many different alloys containing mainly copper, some tin and small amounts of other elements. There is, therefore, no precise answer. Generally, though, the ratio of copper to tin will be 997:3
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There is no specific ratio for bronze because there are many different bronzes. For example, Aluminium bronze contains 92% copper, 8% aluminium. Phosphor bronze contains 89.75% copper, 10% in and 0.25% phosphorus. Manganese bronze contains 58.5% copper, 39.2% zinc, 1% Iron, 1% tin, 0.3% manganese.
The tin weight is 7g !
Yes, there is a bronze ratio: (3 + sqrt(13)) / 2.
The prices of silver and copper are always fluctuating. The price of silver is currently 0.67 USD / g. The price of copper is currently 0.0067 USD / g. The ratio of the price of silver to copper is 100:1.
Cents were struck in bronze up till the middle of 1982. Anything before that (except for 1943, of course) would be bronze.