Quelpr
3 marksRadioactivity

CAPE Physics Unit 2 · 2001 · Paper 2 · Question 9(c)(i)

A radioactive sample contains 3.5 × 10^(-6) g of pure ^11_6C. A table provides activity A against time t.

Determine the number of nuclei present initially.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 9(a)(i)Explain the meaning of the statement that ^14_6C has a half-life of 55 s.[2 marks]
  2. 9(a)(ii)Explain the meaning of the statement that ^14_6C has a decay-constant of 1.25 × 10^(-2) s^(-1).[2 marks]
  3. 9(a)(iii)Explain the meaning of the statement that the radioactive decay of ^14_6C is a random and spontaneous process.[3 marks]
  4. 9(b)Name ONE external condition that does not affect radioactive decay.[1 mark]
  5. 9(c)(ii)Determine the decay constant from the data provided.[3 marks]
  6. 9(c)(iii)Determine the half-life of the sample.[2 marks]
  7. 9(c)(iv)Determine the activity after 8 hours.[2 marks]
  8. 9(c)(v)Determine the number of radioactive nuclei remaining after 8 hours.[2 marks]

More practice: the rest of this paper · more Radioactivity questions · all CAPE Physics Unit 2 past papers