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9702/41/M/J/24 · question 2 of 3 in this topic

Question 9

9(a)1 mark

Define half-life of a radioactive isotope.

Your answer

Suggested time: 2 min

9(b)(i)1 mark

Radioactive isotope X decays to isotope Y. A sample contains only nuclei of X at time t = 0.

State the name of the quantity represented by the magnitude of the gradient of line X in Fig. 9.1.

Fig. 9.1 — see the question text for what it shows

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

Your answer

Suggested time: 2 min

9(b)(ii)3 marks

Radioactive isotope X decays to isotope Y. A sample contains only nuclei of X at time t = 0.

State three conclusions about X or Y that may be drawn from Fig. 9.1. The conclusions may be qualitative or quantitative.

Fig. 9.1 — see the question text for what it shows

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

Your answer

Suggested time: 5 min

9(c)3 marks

Radioactive isotope X decays to isotope Y; a sample contains only nuclei of X at time t = 0, the number of nuclei of X then being 4.0 × 10²² . The mass of radioactive isotope X in the sample is 7.3 × 10⁻⁴ kg at time t = 0.

Determine the nucleon number of isotope X.

Fig. 9.1 — see the question text for what it shows

Determine Work it out from what you are given or from the figure, and show how you got there.

Your answer

Suggested time: 5 min

9702/41/M/J/24Cambridge International AS & A Level Physics 9702 · May/June 2024 · Paper 4 variant 1 · sit the whole paper