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Cambridge IGCSE Physics practice

Paper 4 structured question: Half-life

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Half-life

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Paper 4Theory (Extended)4 marks

The role of radiation in food safety.

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Food Irradiation

Food irradiation uses gamma rays to eliminate bacteria and extend shelf life. It is a safe method approved by health organizations.

  1. a

    Explain how food irradiation works and its benefits.

    Aim for approximately 4 distinct marking points.

    [4]

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Paper 4 structured question: Half-life

Paper 4Theory (Extended)1 marks

Description

Isotope Applications

Different isotopes are used in various applications based on their radiation type and half-life. For example, alpha radiation is used in smoke alarms, while gamma radiation is used for sterilization and cancer treatment.

  1. a

    State one application of gamma radiation in medicine.

    Aim for approximately 1 distinct marking point.

    [1]