Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 39

A nucleus of neptunium-236 contains 93 protons and 143 neutrons. This nucleus decays with the emission of an α-particle. The nucleus formed then emits a β– particle. Which diagram shows the changes in the number P of protons and the number N of neutrons in these nuclei?

1. Agraph A
2. Bgraph B
3. Cgraph C
4. Dgraph D

As printed in the paper