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2 marksRadioactivity

CAPE Physics Unit 2 · 2012 · Paper 2 · Question 6(a)(i)

Radioactive decay principles, notation, half-life, and decay constant calculations for carbon-11.

State the number of protons, neutrons, and electrons in a neutral atom of 226_86 Rn.

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Other parts of this question

  1. 6(a)(ii)Explain what is meant by the term 'isotope'.[2 marks]
  2. 6(b)Define 'half-life' and 'decay constant, λ' for a radioactive nucleus, and write an equation relating the two quantities.[3 marks]
  3. 6(c)(i)Determine the number of nuclei in the 3.50 μg sample of pure 11_6 C at t = 0.[2 marks]
  4. 6(c)(ii)Determine the decay constant of the carbon-11 sample.[2 marks]
  5. 6(c)(iii)Determine the activity of the sample at t = 0.[2 marks]
  6. 6(c)(iv)Determine the activity of the carbon-11 after 8 hours.[2 marks]

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