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5 marksRadioactivity

CAPE Physics Unit 2 · 2014 · Paper 2 · Question 3(d)

Carbon-14 decays to nitrogen by beta emission with a half-life of 5730 years. Determine the percentage of carbon-14, relative to the initial amount, which would remain after 20 000 years.

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  1. 3(a)Write a brief description of an experiment to determine the half-life of a radioactive sample.[5 marks]
  2. 3(b)State THREE properties of a radioisotope which would make it suitable for use in radiotherapy.[3 marks]
  3. 3(c)Carbon-14, ^{14}_{6}\text{C}, is produced naturally in the upper atmosphere by neutron bombardment of atmospheric nitrogen, ^{14}_{7}\text{N}. Derive the…[2 marks]

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