Quelpr
5 marksHalf-life

CSEC Physics · 1991 · Paper 2 · Question 4(c)(i)

A radioactive material decays with a half-life of 3 days, starting from an initial mass of 8.00 g.

Plot a graph on the grid showing the decay of the 8.00 g mass over a period of 15 days.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 4(a)(i)Determine the number of neutrons and the number of protons in this nuclide.[2 marks]
  2. 4(a)(ii)An electron is represented as ⁰₋₁e. Explain whether a mass number of 0 implies that the electron has zero mass.[2 marks]
  3. 4(b)Complete the balanced nuclear equation for the alpha decay of uranium-238 to thorium-234, and the subsequent beta decay of thorium-234 to protactinium (symbol…[5 marks]
  4. 4(c)(ii)Using the graph or calculation, determine how much of the radioactive material remains after 5 days.[1 mark]
  5. 4(c)(iii)Determine the mass of the material remaining after 9 days if the external pressure were increased by a factor of 10.[1 mark]

More practice: the rest of this paper · more Half-life questions · all CSEC Physics past papers