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 first true copper penny issued by the US mint was minted in 1793, commonly called a large cent due to it's size.The first predominantly copper small cent was is â¦ sued in 1864, after the 1856-1863 cents were a 88-12 copper-nickel alloy that gave them a nickel-like appearance.nswer   1958.   In 1959, the 50th anniversary of the first (1909) Lincoln cent, the wheat ears were replaced with a picture of the Lincoln Memorial.     Wheat â¦ cents were made from 1909 to 1958.