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3 marksRadioactivity

CAPE Physics Unit 2 · 2005 · Paper 1 · Question 8(b)(iii)

The half-life of Radium-226 is 1.6 x 10^3 years.

Calculate the decay rate when the sample is 2.5 x 10^3 years old. [Data: 1 year = 3.2 x 10^7 s]

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Other parts of this question

  1. 8(a)(i)Explain what is meant by half-life when referring to a radioactive source.[1 mark]
  2. 8(a)(ii)Explain what is meant by decay constant when referring to a radioactive source.[1 mark]
  3. 8(b)(i)Calculate the decay constant of Radium-226.[3 marks]
  4. 8(b)(ii)The sample contains 5.0 x 10^16 such nuclei at t = 0. Calculate its activity at this time.[2 marks]

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