CIE A Level Physics

Topic Questions

A LevelPhysicsCIETopic Questions11. Particle Physics11.2 Fundamental Particles

Syllabus Edition

First teaching 2020

Last exams 2024

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11.2 Fundamental Particles

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1a4 marks

Carbon–10 open parentheses straight C presubscript 6 presuperscript 10 close parentheses is an isotope that decays to an isotope of boron (symbol straight B) by the emission of a β+ particle. 

(i)
Complete the nuclear equation for this decay, including the proton and nucleon numbers of all the particles involved.
 
straight C presubscript 6 presuperscript 10 space space space rightwards arrow space
[3] 
(ii)
During the decay, a quark in the carbon-10 nucleus changes into a different type.
 
State the change of quark that occurs.
[1]

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1b2 marks

State the two leptons in this decay.

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1c3 marks

State and explain why a hadron with charge –3e cannot exist. 

e is the elementary charge.

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1d1 mark

State the possible quark combination for a hadron of charge +2e.

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2a2 marks

State the quark composition of an alpha particle.

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2b2 marks

Use the quark model to show that the charge on the anti-neutron is 0.

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2c3 marks

A sigma baryon Σ is a hadron that consists of an up (u) quark, a down (d) quark and a strange (s) quark. 

State the quark composition of Σ+ , Σ0 and Σ– .

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2d1 mark

Explain why a baryon with the quark composition u d with bar on top s cannot exist.

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3a1 mark

State the number of 'up' quarks in the nucleus of Al presubscript 13 presuperscript 27.

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3b2 marks

The straight D particle has a quark structure u c with bar on top .

Determine

 
(i)
the classification of the straight D particle,
[1]
 
(ii)
the charge on the straight D particle.
[1]

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3c1 mark

Using the quark model, show that the magnitude of the charge of a proton is equal to the charge of an electron. 

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3d3 marks
Using the quark model for β+ decay, show that charge is conserved in this decay.

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