DP Physics (last assessment 2024)

Question 21M.2.HL.TZ1.7a

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.HL.TZ1.7a
Level	HL	Paper	2	Time zone	TZ1
Command term	Write down	Question number	a	Adapted from	N/A

[Maximum mark: 1]

21M.2.HL.TZ1.7a

Radioactive uranium-238 $({}_{92}^{238}U)$ produces a series of decays ending with a stable nuclide of lead. The nuclides in the series decay by either alpha (α) or beta-minus (β⁻) processes.

(a)

Uranium-238 decays into a nuclide of thorium-234 (Th).

Write down the complete equation for this radioactive decay.

[1]

Markscheme

${}_{92}^{238}{U→«} {}_{90}^{234}» Th+ « {}_{2}^{4}» α$ ✓

Allow He for alpha.

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 21M.2.HL.TZ1.7a

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