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Date November 2014 Marks available 1 Reference code 14N.1.HL.TZ0.34
Level Higher level Paper Paper 1 Time zone Time zone 0
Command term Question number 34 Adapted from N/A

Question

A radioactive nuclide decays to a stable daughter nuclide. Initially the sample consists entirely of atoms of the radioactive nuclide. What fraction of the sample consists of the daughter nuclide after four half-lives?

A. \(\frac{{15}}{{16}}\)

B. \(\frac{{1}}{{16}}\)

C. \(\frac{{1}}{{8}}\)

D. \(\frac{{7}}{{8}}\)

Markscheme

A

Examiners report

A simple diagram showing the depletion of the sample with increasing half-lives is needed. Those who chose B were perhaps jumping to conclusions without such a visual image.

Syllabus sections

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