AS AQA Phys Unit 1 (2)

Practice exam questions/important points with relevent answers/descriptions on the reverse side. This set is for particles and antiparticles and classification of particles.

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What is the equation for the reaction between a positron and an electron and what type of reaction is it? (2 marks)
e+ + e- ---> y + y (positron + electron makes 2 gamma ray photons) (1) This is called annihilation (1)
1 of 7
Explain why the mass of a block of iron cannot be converted directly into energy. (2 marks)
The protons, neutrons and electrons which make up the iron atoms would need to annihilate with their antiparticles (1) No antiparticles are available for this to happen in the iron block (1)
2 of 7
Why is the reaction; proton + proton ---> proton + proton + neutron not possible? (1 mark)
The creation of a particle of matter also requires the creation of its corresponding antiparticle. In this case no antineutron has been produced (1)
3 of 7
What are the decay products of the neutron? (1 mark)
Proton, neutron and electron-antineutrino (1)
4 of 7
Why can't neutron decay be due to the strong interaction? (2 marks)
The electron and electron-antineutrino in the decay are leptons (1) Leptons are not affected by the strong interaction, so the decay cannot be due to the strong interaction (1)
5 of 7
What are the differences between a meson and a muon? (3 marks)
A meson is a hadron and a muon is a lepton (1) The muon is a fundamental particle, the meson is not. Mesons are built up from simpler particles (1) Mesons interact via the strong interaction, the muon does not (1)
6 of 7
What is currently the only stable baryon? (1 mark)
A proton (1)
7 of 7

Other cards in this set

Card 2

Front

Explain why the mass of a block of iron cannot be converted directly into energy. (2 marks)

Back

The protons, neutrons and electrons which make up the iron atoms would need to annihilate with their antiparticles (1) No antiparticles are available for this to happen in the iron block (1)

Card 3

Front

Why is the reaction; proton + proton ---> proton + proton + neutron not possible? (1 mark)

Back

Preview of the front of card 3

Card 4

Front

What are the decay products of the neutron? (1 mark)

Back

Preview of the front of card 4

Card 5

Front

Why can't neutron decay be due to the strong interaction? (2 marks)

Back

Preview of the front of card 5
View more cards

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