(i) Define 'activity' of a radioactive substance.

(ii) Two different radioactive elements with half lives T1 and T2 have N1 and N2 undecayed atoms

     respectively present at a given instant. Derive an expression for the ratio of their activities at this 

     instant in terms of N1 and N2.                                                                                                                                                                                                                                      (3 marks)

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