Available practice: 94 of 100 marks. Parts 3(a)(i), 7(a), 8(a) await marking support. Scores cover available parts only.
(a)Define half-life of a radioactive isotope.
[1 mark]
Radioactive isotope X decays to isotope Y. A sample contains only nuclei of X at time t = 0.
(b)(i)State the name of the quantity represented by the magnitude of the gradient of line X in Fig. 9.1.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[1 mark]
(b)(ii)State three conclusions about X or Y that may be drawn from Fig. 9.1. The conclusions may be qualitative or quantitative.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[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.
(c)Determine the nucleon number of isotope X.
Answer guidance
Determine Work it out from what you are given or from the figure, and show how you got there.
[3 marks]
9702/41/M/J/24Cambridge International AS & A Level Physics 9702 · May/June 2024 · Paper 4 variant 1 · Question 9
