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8 marksScientific Method

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

The activity of a radioactive sample was measured over a six-hour period. The results are recorded in Table 1.

Using the grid on page 5, plot a graph of Activity (A) versus Time (t).

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

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Other parts of this question

  1. 1(b)(i)From your graph, determine the half-life of the sample.[5 marks]
  2. 1(b)(ii)Using your graph, determine a more accurate value of the half-life of the sample.[6 marks]
  3. 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…[2 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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