Physics · May / June 2024 · Paper 41 · Question 8
0625
As printed in the paper
The question as text
The isotope thallium-208 (208 81Tl ) is radioactive. It decays by β-decay.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
8(a)(i)[3]
0
–1208
Pb
…..
…..
Pb
82
8(a)(ii)[1]
γ-emission / it consists of waves / rays OR γ-emission has no mass / charge
8(a)(iii)[1]
(it contains) too many / excess of neutrons OR (nucleus is) too heavy
8(b)[3]
smooth curve (through magnetic field) AND labelled β
path towards bottom of page AND no upward component AND labelled β
(continuation of beam along) horizontal line through magnetic field AND labelled γ
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