Available practice: 76 of 80 marks. Parts 10(c) await marking support. Scores cover available parts only. Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.
A radioactive source emits α-particles, β-particles and γ-radiation.
(a)(i)Which of α, β and γ produces the strongest ionising effect?
[1 mark]
(a)(ii)Which of α, β and γ is deflected most by a magnetic field?
[1 mark]
(b)(i)Fig. 9.1 gives 800 counts at 10 cm. In Fig. 9.2 a 5 mm metal sheet reduces this to 200 counts; both readings have background correction. Explain how this shows that the source emits β-particles and γ-radiation.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[3 marks]
(b)(ii)Explain why the readings in Fig. 9.1 and Fig. 9.2 cannot show whether the source emits α-particles.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[1 mark]
(c)Describe one way to move a radioactive source safely in a school laboratory.
Answer guidance
Describe Say what happens, in order. Reasons are not required unless the question also asks why.
[1 mark]
5054/22/M/J/23Cambridge O Level Physics 5054 · May/June 2023 · Paper 2 variant 2 · Question 9