Definition of 'optimum'. Word Frequency. optimum (ÉptÉªmÉm ) or optimal. adjective. The optimum or optimal level or state of something is the best level or state that it could achieve. [formal] Aim to do some physical activity three times a week for optimum health. ...regions in which optimal conditions for farming can be created.
Quick Answer. Pennies produced by the U.S. Mint since 1982 are an alloy of 2.5 percent copper and 97.5 percent zinc. The penny weighs 2.5 grams, so each penny contains 0.0625 grams of copper.
The highest amount paid for a 1943 copper cent was $82,500 in 1996. Because of its collector value, the 1943 copper cent has been counterfeited by coating steel cents with copper or by altering the dates of 1945, 1948, and 1949 pennies.The easiest way to determine if a 1943 cent is made of steel, and not copper, is to use a magnet.If it sticks to the magnet, it is not copper. If it does not stick, the coin might be of copper and should be authenticated by an expert.early all circulating pennies at that time were struck in zinc-coated steel because copper and nickel were needed for the Allied war effort. 40 1943 copper-alloy cents are known to remain in existence.