Cambridge IGCSE Physics practice

Paper 3 structured question: Half-life

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Paper

Marks

Topic

Half-life

Exam-style question

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Paper 3Theory (Core)1 marks

Radioactive decay of a sample is observed over time.

Description

A sample of a radioactive isotope has a half-life of 5 years. After 15 years, how much of the original sample remains?

a
State the half-life of the isotope.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 3Theory (Core)2 marks

Description

If you start with a 200g sample, how much will remain after 30 years?

a
Define the term half-life.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
State how much of the original sample remains after 30 years.
Your answer
Aim for approximately 1 distinct marking point.
[1]