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Physics (AS & A Level) · May / June 2026 · Paper 13 · Question 40

9702Atoms, nuclei and radiation

A nucleus X is plotted on a graph of neutron number N against proton number Z. The nucleus undergoes α-decay. Which arrow shows the changes in N and Z?

  1. AGraph A: arrow from X at (Z=94, N=144) to (Z=92, N=140)
  2. BGraph B: arrow from (Z=90, N=142) to X at (Z=94, N=144)
  3. CGraph C: arrow from X at (Z=94, N=144) to (Z=92, N=142)
  4. DGraph D: arrow from X at (Z=94, N=144) to (Z=95, N=143)

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Correct answer: C. Graph C: arrow from X at (Z=94, N=144) to (Z=92, N=142)

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