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Cambridge IGCSE Physics

5.2.1Detection of radioactivity

Detection of radioactivity in Cambridge IGCSE Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic12 practice questions1 lesson

Learning objectives

What the syllabus expects you to be able to do.

  1. 5.2.1.1Know what background radiation is.
  2. 5.2.1.2Know the main sources of background radiation: radon gas, rocks and buildings, food and drink, and cosmic rays.
  3. 5.2.1.3Know that ionising radiation is measured with a detector connected to a counter.
  4. 5.2.1.4Use count rates in counts per second or counts per minute.
  5. 5.2.1.5Supplement: use measurements of background radiation to find a corrected count rate.

Lessons

  • Background radiation and detecting radiation

    22 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Detection of radioactivity: sample question

1 mark

A detector records 2400 counts in 4.0 minutes. What is the count rate in counts per minute?

Answer in counts/min.

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