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Question 9 a) Define the activity of a radioactive source b) The activity of a radioactive source is proportional to the number of radioactive nuclei

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Question 9 a) Define the activity of a radioactive source b) The activity of a radioactive source is proportional to the number of radioactive nuclei present within it. What is the name given to the constant of proportionality which links these two quantities, and what is its SI unit? c) Define the half-life of a radioactive material. [3.2]

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