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2 marksHalf-life

CSEC Physics · May/June 2022 · Paper 2 · Question 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 original activity level. State the time taken.

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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)(i)Define the term 'half-life'.[2 marks]
  3. 1(b)(ii)From your graph, calculate the average half-life of the radioactive substance.[5 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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