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2 marksHalf-life

CSEC Physics · May/June 2022 · Paper 2 · Question 1(b)(i)

Define the term 'half-life'.

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Other parts of this question

  1. 1(a)Using the grid in Figure 1, plot a graph of activity, A, against time, t, and draw a smooth curve.[8 marks]
  2. 1(b)(ii)From your graph, calculate the average half-life of the radioactive substance.[5 marks]
  3. 1(b)(iii)On your graph, use dotted lines to determine how long it would take for the activity of the sample to be reduced to ten disintegrations per minute from its…[2 marks]
  4. 1(c)(i)Define the term 'nuclear fission'.[1 mark]
  5. 1(c)(ii)Using the atomic mass data in Table 2, calculate the energy released in the reaction in joules. [where u = 1.66 * 10^-27 kg, c = 3.0 * 10^8 m s^-1][7 marks]

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