DP Physics (last assessment 2024)

Question 22M.2.SL.TZ2.5d

Date	May 2022	Marks available	[Maximum mark: 2]	Reference code	22M.2.SL.TZ2.5d
Level	SL	Paper	2	Time zone	TZ2
Command term	Write down	Question number	d	Adapted from	N/A

[Maximum mark: 2]

22M.2.SL.TZ2.5d

An experiment is carried out to determine the count rate, corrected for background radiation, when different thicknesses of copper are placed between a radioactive source and a detector. The graph shows the variation of corrected count rate with copper thickness.

(d)

Another radioactive source consists of a nuclide of caesium $({}_{55}^{137}{Cs})$ that decays to barium $({}_{56}^{137}{Ba})$ .

Write down the reaction for this decay.

[2]

Markscheme

${}_{55}^{137}{Cs} \to {}_{56}^{137}{Ba} + {}_{- 1}^{0}β$ ✓

$+ {\bar{v}}_{e}$ ✓

Accept β or e in MP1.

Do not penalize if proton / nucleon numbers or electron subscript in antineutrino are missing.

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.SL.TZ2.5d

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