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Date May 2022 Marks available 1 Reference code 22M.1.SL.TZ1.27
Level Standard level Paper Paper 1 Time zone 1
Command term Question number 27 Adapted from N/A

Question

U92238 undergoes an alpha decay, followed by a beta-minus decay. What is the number of protons and neutrons in the resulting nuclide?

Markscheme

C

Examiners report

This question was generally well answered by candidates, however a significant number selected option A (incorrectly) perhaps due to confusion between nuclear mass and the number of neutrons. This question had a relatively high discrimination index.

Syllabus sections

Core » Topic 7: Atomic, nuclear and particle physics » 7.1 – Discrete energy and radioactivity
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Core » Topic 7: Atomic, nuclear and particle physics
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