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5. The activity of 1g charcoal (4C) from the fire pit of an ancient campsite is activity 12.9 disintegration per minute. Percentage of 4C

5. The activity of 1g charcoal (4C) from the fire pit of an ancient campsite is activity 12.9 disintegration per minute. Percentage of 4C compared with average normal carbon-12 (2C) in living trees is only 1.35 x 10-10%. (Given half-life of 4C is 5730 years) (a) Find the initial no. of 4C atoms in the charcoal. (4 marks) (b) What is the age of the charcoal? (8 marks)

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