DP Physics (last assessment 2024)
Question 17N.2.HL.TZ0.a.i
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.2.HL.TZ0.a.i |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain, State | Question number | a.i | Adapted from | N/A |
a.i.
[Maximum mark: 3]
17N.2.HL.TZ0.a.i
The Feynman diagram shows electron capture.
State and explain the nature of the particle labelled X.
[3]
Markscheme
«electron» neutrino
it has a lepton number of 1 «as lepton number is conserved»
it has a charge of zero/is neutral «as charge is conserved»
OR
it has a baryon number of 0 «as baryon number is conserved»
Do not allow antineutrino
Do not credit answers referring to energy
