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Date	November 2011	Marks available	1	Reference code	11N.1.HL.TZ0.32
Level	Higher level	Paper	Paper 1	Time zone	Time zone 0
Command term		Question number	32	Adapted from	N/A

Question

The half-life of a radioactive nuclide is 20s. What fraction of the original sample will have decayed in one minute?

A. $\frac{1}{8}$

B. $\frac{1}{4}$

C. $\frac{1}{2}$

D. $\frac{7}{8}$

Markscheme

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Far too many candidates selected response A, indicating that they had not carefully read the question.

Syllabus sections

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

Show 124 related questions

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17M.2.HL.TZ2.5a: Write down the nuclear equation for this decay.
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16M.1.SL.TZ0.24: ...
15M.1.SL.TZ1.23: Nucleus P decays by a sequence of emissions to form nucleus Q. One $\alpha$ particle and...
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15M.3.SL.TZ2.6b: Show that a photon of wavelength 656 nm can be emitted from a hydrogen atom.
14M.1.SL.TZ1.24: A radioactive sample has activity A0 at t=0. What will be the activity of the sample after...
14M.1.HL.TZ1.32: The de Broglie wavelength of an electron is equal to the wavelength of a photon that has...
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11M.1.HL.TZ2.29: ...
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