Physics (AS & A Level) · May / June 2016 · Paper 42 · Question 13

(photons of) electromagnetic radiation emitted from nuclei [2]

line of best fit drawn recognises µ as given by the gradient of best-fit line or ln C = ln C0 – µx µ = 0.061 mm–1 (within ±0.004 mm–1, 1 mark;

within ±0.002 mm–1, 2 marks) [4]

aluminium is less absorbing (than lead) or gradient of graph would be less so µ is smaller [2]