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Carbon-14, `overset 14 6` C, is used in carbon dating. It decays to form nitrogen, `overset 14 7` N . The graph below shows the amount of carbon-14 left in a sample against its age in years.
(a ) Write a nuclear equation for the decay process of carbon -14.
(b)From the graph, determine the: (i) half-life of carbon-14; (ii) percentage of carbon -14 in a sample whose age is 1950 years.