CAIE IGCSE Physics Comparing Infrared Absorbers
Practise designing a matched-can experiment that compares infrared absorption through temperature rise while controlling distance, water and geometry.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- place matched black and shiny cans equally far from a heater with equal water volumes
- compare thermometer rises and identify the black surface as the better infrared absorber
2.3.3.8—Experiments to distinguish between question 1
A student wants to investigate good and bad absorbers of thermal radiation. She has the apparatus shown in Fig. 5.1, a supply of cold water and a metre rule.
Fig. 5.1
Explain how the student could use the apparatus she has available to carry out her investigation. Describe the results she would expect to obtain. Draw a diagram of the set-up.
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