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Question 19M.1A.HL.TZ2.25

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.HL.TZ2.25
Level HL Paper 1A Time zone TZ2
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
19M.1A.HL.TZ2.25

The positions of stable nuclei are plotted by neutron number n and proton number p. The graph indicates a dotted line for which n = p. Which graph shows the line of stable nuclides and the shaded region where unstable nuclei emit beta minus (β-) particles?

[1]

Markscheme

D

Examiners report

This question proved challenging, a low discrimination index and a relatively even spread of answers suggests that maybe guesswork was responsible for the candidates choice.

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