DP Physics (last assessment 2024)

Question 20N.2.SL.TZ0.6c(ii)

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.2.SL.TZ0.6c(ii)
Level	SL	Paper	2	Time zone	TZ0
Command term	State	Question number	c(ii)	Adapted from	N/A

c(ii).

[Maximum mark: 1]

20N.2.SL.TZ0.6c(ii)

A sample of waste produced by the reactor contains $1.0 kg$ of strontium-94 (Sr-94). Sr-94 is radioactive and undergoes beta-minus ( $β^{-}$ ) decay into a daughter nuclide X. The reaction for this decay is

${}_{38}^{94}{Sr} \to X + {\bar{v}}_{e} + e$ .

The graph shows the variation with time of the mass of Sr-94 remaining in the sample.

(c(ii))

State the half-life of Sr-94.

[1]

Markscheme

$75 « s »$ ✓

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Core

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

Core » Topic 7: Atomic, nuclear and particle physics

Question 20N.2.SL.TZ0.6c(ii)

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