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Date May 2017 Marks available 1 Reference code 17M.1.SL.TZ2.25
Level Standard level Paper Paper 1 Time zone Time zone 2
Command term Question number 25 Adapted from N/A

Question

The half-life of a radioactive element is 5.0 days. A freshly-prepared sample contains 128 g of this element. After how many days will there be 16 g of this element left behind in the sample?

A. 5.0 days

B. 10 days

C. 15 days

D. 20 days

Markscheme

C

Examiners report

[N/A]

Syllabus sections

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