DP Physics (last assessment 2024)

Question 22M.2.HL.TZ1.a

Date	May 2022	Marks available	[Maximum mark: 2]	Reference code	22M.2.HL.TZ1.a
Level	HL	Paper	2	Time zone	TZ1
Command term	Write down	Question number	a	Adapted from	N/A

[Maximum mark: 2]

22M.2.HL.TZ1.a

Potassium-40 $({}_{19}^{40}K)$ decays by two processes.

The first process is that of beta-minus (β⁻) decay to form a calcium (Ca) nuclide.

Write down the equation for this decay.

[2]

Markscheme

${}_{20}^{40}{Ca}$ ✓

${}_{- 1}^{0}e + {\bar{ν}}_{e}$ OR ${}_{- 1}^{0}β + {\bar{ν}}_{e}$ ✓

Full equation ${}_{19}^{40}K \to {}_{20}^{40}{Ca} + {}_{- 1}^{0}e + {\bar{ν}}_{e}$

Examiners report

This question was very well done by candidates. The majority were able to identify the correct nuclide of Calcium and many correctly included an electron/beta particle and a properly written antineutrino.

Syllabus sections

Core

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

Core » Topic 7: Atomic, nuclear and particle physics

Question 22M.2.HL.TZ1.a

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