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2 marksParticles in the Atom

CSEC Physics · 1991 · Paper 2 · Question 4(a)(ii)

A nuclide of uranium-238 is represented by the symbol ²³⁸₉₂U.

An electron is represented as ⁰₋₁e. Explain whether a mass number of 0 implies that the electron has zero mass.

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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(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]
  3. 4(c)(i)Plot a graph on the grid showing the decay of the 8.00 g mass over a period of 15 days.[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]

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