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2 marksHalf-life

CSEC Physics · May/June 2016 · Paper 2 · Question 1(c)

From your graph, and using dotted lines, determine how long it takes for the activity of the sample to be reduced to 10 disintegrations per second, from its original activity level.

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Other parts of this question

  1. 1(a)Using the grid on page 5, plot a graph of Activity (A) versus Time (t).[8 marks]
  2. 1(b)(i)From your graph, determine the half-life of the sample.[5 marks]
  3. 1(b)(ii)Using your graph, determine a more accurate value of the half-life of the sample.[6 marks]
  4. 1(d)State ONE reason why a line drawn through all the points would not form a perfectly smooth curve.[1 mark]
  5. 1(e)All elements including radioactive substances have an 'atomic number' and 'mass number'. Explain what the two terms mean. Atomic number: Mass number:[2 marks]
  6. 1(f)In medicine, Iodine-123, [¹²³₅₃I] is used to check a patient's thyroid function. What does '123' represent?[1 mark]

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