9 GeV / c.
initial direction
of electron 20°
proton
Deduce whether the law of conservation of momentum is obeyed.
(3)
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(iii) The collisions between electrons and the protons in these experiments are
sometimes inelastic.
State what is meant by an inelastic collision.
(1)
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(Total for Question 15 = 14 marks)
Question
Physics
Edexcel2022
*P69306A01928*
Turn over
PMT
(d) The mass of a neutron is about the same as the mass of a proton. A student suggests
that the minimum kinetic energy the cosmic ray proton would need to create the
pion in this collision is 140 MeV.
Discuss whether this suggestion is correct. Your answer should include reference to
the laws of conservation of momentum and conservation of energy.
(4)
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(Total for Question 17 = 12 marks)