PHYSICS 7408 (PHYSICS 7408)
Imperial Valley College
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Stuvia-1113656-aqa-a-level-physics-paper-1-2019-question-paper
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Two isotopes of iodine are 125 
53 I and 131 
53 I. 
Determine, for these two isotopes, the difference between the constituents of the 
nuclei. 
[1 mark] 
0 1 . 2 A 131 
53 I nuclide undergoes beta (β– 
) decay to form a xenon nuclide. 
State the nucleon number of the xenon nuclide. 
[1 mark] 
0 1 . 3 A 125 
53 I nuclide decays by electron capture to form a tellurium nuclide. 
State two differences between the constituents of the iodine nucleus and the tellurium 
nucleus it decays into. 
[2 m...
AQA A-Level Physics Paper 2 2019 
Mark Scheme- A-LEVEL 
PHYSICS 
7408/2 
Paper 2 
Mark scheme 
June 2019
AQA A-Level Physics Paper 1 2019 Question Paper
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