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3 marksRadioactivity

CAPE Physics Unit 2 · 2001 · Paper 1 · Question 9(a)

Radioactive decay law.

For radioactive decay A = λN, complete the table giving the name of EACH term and the corresponding S.I. unit.

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Other parts of this question

  1. 9(b)(i)State the physical condition which ensures a good though not exact obedience to the radioactive decay law N = N₀ exp(-λt).[1 mark]
  2. 9(b)(ii)Calculate the number of atoms in 1 g of ²²⁶₈₈Rn.[1 mark]
  3. 9(c)(i)A particular radioactive element has a half-life of 100 years. Calculate its value of λ.[2 marks]
  4. 9(c)(ii)After how many years will it take a whole year for this element to emit the same number of particles as it does in one day now? (1 year = 365 days).[3 marks]

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