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Exam (elaborations)
A Level Physics Paper 1 November 2020 Updated Question Paper/Real Exam
A Level Physics Paper 1 November 2020 Updated 
Question Paper/Real Exam 
1 
2 
Answer all questions in the spaces provided. 
Do not write 
outside the 
box 
One strong interaction that occurs when two high-energy protons collide is 
p + p → p + π 
+ 
+ π 
− 
+ X 
. Determine the lepton number, strangeness and charge of particle X. 
[2 marks] 
lepton number = 
strangeness = 
charge = 
. Identify particle X. 
[1 mark] 
0 1 
0 1 
0 1 
lOMoAR cPSD| 
3 
*03* 
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