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Cambridge IGCSE Physics practice

Why is it important to control the distance from the heat source in an absorption experiment?

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MCQ

Type

cambridge_mcq

Style

Topic

Radiation

Exam-style question

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Why is it important to control the distance from the heat source in an absorption experiment?.

  1. A.To ensure the lamp does not overheat
  2. B.To maintain consistent exposure to infrared radiation
  3. C.To prevent the materials from burning
  4. D.To reduce the time of the experiment

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Method

Method for Testing Infrared Absorption

Different materials are placed at equal distances from an infrared lamp. The temperature of each material is measured after a set time of exposure to the lamp.

MaterialInitial Temperature (°C)Final Temperature (°C)
Black paper2045
White paper2030
Aluminum foil2025
Glass2022
  1. a

    Identify Identify the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]