AS AQA Phys Unit 1 (3)

Practice exam questions/important points with relevent answers/descriptions on the reverse side. This set is for quarks and for exchange particles and feynmann diagrams.

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What is the quark composition of a negative pion and how do the charges of the quarks give rise to its charge? (2 marks) -use Data and Formulae Booklet
The quark composition is one down, one anti-up (1) Charge of a down quark is -1/3 and charge of an up quark is -2/3 so the total charge is -1 (1)
1 of 7
Which type of particle is made from a quark and antiquark? (1 mark)
A meson (1)
2 of 7
How is quark composition changed in the beta-minus decay of a neutron? (2 marks)
The weak interaction converts a down quark into an up quark and produces an electron and electron-antineutrino (1) The neutron (udd) becomes a proton (uud) (1)
3 of 7
Why is it that the reaction of p + p ---> p + K^+ (proton + proton makes proton + positive kaon) cannot happen? (2 marks) -use Data and Formulae Booklet
Baryon number changes from 2 to 1, so baryon number is not conserved (1) The strangeness changes from 0 to 1, so strangeness is not conserved (1)
4 of 7
How is the force of electromagnetic repulsion between two protons explained by particle exchange? (2 marks)
The electrostatic force is due to the exchange of virtual photons which only exist for a very short time (1) The force is due to momentum transferred or gained from the photons as they are emitted or absorbed by a proton (1)
5 of 7
Which gauge bosons are exchanged in weak interactions? (3 marks)
The W-positive boson, (1) the W-negative boson (1) and the Z-neutral boson (1)
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What is a virtual particle? (2 marks)
A particle which is not directly detected (1) but if intercepted can stop a force from acting (1)
7 of 7

Other cards in this set

Card 2

Front

Which type of particle is made from a quark and antiquark? (1 mark)

Back

A meson (1)

Card 3

Front

How is quark composition changed in the beta-minus decay of a neutron? (2 marks)

Back

Preview of the front of card 3

Card 4

Front

Why is it that the reaction of p + p ---> p + K^+ (proton + proton makes proton + positive kaon) cannot happen? (2 marks) -use Data and Formulae Booklet

Back

Preview of the front of card 4

Card 5

Front

How is the force of electromagnetic repulsion between two protons explained by particle exchange? (2 marks)

Back

Preview of the front of card 5
View more cards

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