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A level: Radioactivity Questions

Q6. A radioactive nuclide decays by emitting particles. The graph shows how the rate of decay At of the source changes with time t

(a) Determine

(i) the half-life of the nuclide,

(ii) the decay constant,

(iii) the initial number of undecayed nuclei present at time t = 0.

(5 marks)

(b) Each decay releases 1.0 x 10–12J.

For the time interval between t = 30s and t = 80s, calculate:

(i) the number of nuclei which decay,

(ii) the energy released.

(4 marks)

(Total 9 marks)