| Date | May 2015 | Marks available | 2 | Reference code | 15M.3.HL.TZ1.22 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Describe and State | Question number | 22 | Adapted from | N/A |
Question
This question is about particles and interactions.
When a free neutron decays to a proton, an electron is one of the decay products.
(i) State the name of the exchange particle and the interaction involved in this decay.
(ii) The interaction and the exchange particle in (a)(i) may arise when a quark decays. Describe the change in the quark structure of the neutron.
Markscheme
(i) W/intermediate vector boson and weak; (both needed for mark)
(ii) d in neutron changes to u (in proton);
Examiners report
[N/A]
Syllabus sections
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