Exam (elaborations)
AQA AS PHYSICS Paper 1 Wednesday 17 May 2023
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AQA AS PHYSICS Paper 1 Wednesday 17 May 2023
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AQAAS
PHYSICS
Paper 1
Wednesday 17 May 2023
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 interaction between a negative kaon (K−) and a proton (p) produces
A strong
an omega-minus (Ω−) particle, a neutral kaon (K0) and an unidentified particle Y.
The interaction is:
K− + p → Ω− + K0 + Y
Table 1 contains information on the particles in this interaction.
Table 1
K− p Ω− K0 Y
Rest energy / MeV 493.8 938.3 1672 497.8 493.8
Baryon number +1 +1 0
Charge −1e +1e −1e 0
Strangeness −1 0 −3 +1
0 1 .1 Complete Table 1.
[2 marks]
0 1 .2 Calculate, in J, the rest energy of the Ω−.
[2 marks]
rest energy = J
IB/M/Jun23/7407/1
, 3
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0 1 . 3 Suggest how energy is conserved in this interaction. box
Refer to the rest energies of the particles in Table 1.
[2 marks]
The quark structure of the Ω− particle is sss.
The Ω− is unstable. It decays into a proton through a series of decays:
Ω− → Ξ0 + π−
followed by
Ξ0 → Λ0 + π0
followed by
Λ0 → p + π−
The Ξ0 and Λ0 are both hadrons.
0 1
. 4 Deduce the quark structure of the Λ0 particle.
[4 marks]
quark structure of Λ0 =
Question 1 continues on the next page
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IB/M/Jun23/7407/1
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IB/M/Jun23/7407/1
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