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2 marksHalf-life

CSEC Physics · May/June 2019 · Paper 2 · Question 6(b)(i)

In four days, the activity of a sample of lithium decreases to one-sixteenth of its original activity.

Define the term 'half-life'.

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Other parts of this question

  1. 6(a)(i)Use the information given above to determine the number of protons and neutrons present in an atom of lithium-7.[2 marks]
  2. 6(a)(ii)Draw a clearly labelled diagram of the structure of the lithium-7 atom.[4 marks]
  3. 6(b)(ii)Calculate the half-life of lithium.[3 marks]
  4. 6(c)Calculate the energy given off in a nuclear reaction if the change in mass is 0.2014 u.[4 marks]

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