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Question 19N.3.HL.TZ0.c

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.3.HL.TZ0.c
Level HL Paper 3 Time zone TZ0
Command term Discuss Question number c Adapted from N/A
c.
[Maximum mark: 3]
19N.3.HL.TZ0.c

Discuss one process by which elements heavier than iron are formed in stars.

[3]

Markscheme

ALTERNATIVE 1 — s-process
s-process involves «slow» neutron capture ✔
in s-process beta decay occurs before another neutron is captured ✔
s-process occurs in giant stars «AGB stars» ✔
s-process terminates at bismuth/lead/polonium ✔


ALTERNATIVE 2 — r-process
r-process involves «rapid» neutron capture ✔
in r-process further neutrons are captured before the beta decay occurs ✔
r-process occurs in type II supernovae ✔
r-process can lead to elements heavier than bismuth/lead/polonium ✔

NOTE: If the type of the process (r or s/rapid or slow) is not mentioned, award [2 max].

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