1. Required Practical Guide IR Radiation and Absorption
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Required Practical Guide
Physics
IR Radiation and Absorption
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR, Edexcel
Potential examination questions and answers
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
Commissioned by The PiXL Club Ltd. November 2016
The PiXL Club Ltd, Company number
© Copyright The PiXL Club Ltd, 2016

2. Required practical – exam boards
AQA

3. Practical procedure: IR Radiation and Absorption
Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.
Video 1
Video 2

4. Possible examination style questions
A cube container with sides made from four different materials, was filled with boiling water. A thermometer was placed next to, but not touching each surface. Here are the results:
Explain the difference in the temperatures.
Describe the variables you would need to keep the same to ensure the results were reliable.
Explain why it would be a good idea to paint radiators in a house black.
Why is it better to use a cube rather than four separate containers?
Colour
White
Silver
Black -shiny
Black -matt
Temperature/ oC
49.8
27.3
68.0
66.3

5. Possible examination style questions answers
Explain the difference in the temperatures.
ANSWER:
Dull surfaces are better emitters of thermal/ infra-red radiation than shiny surfaces
Darker surfaces are better emitters of thermal/ infra-red radiation than lighter surfaces
So dull, black surfaces are better emitters of thermal radiation than shiny, light surfaces

6. Possible examination style questions answers
Describe the variables you would need to keep the same to ensure the results were reliable.
ANSWER:
Temperatures taken at the same time/ thermometers next to all surfaces
Thermometers all same distance from surface
Ensure surfaces have the same area

7. Possible examination style questions answers
Explain why it would be a good idea to paint radiators in a house black.
ANSWER: Matt-black surfaces are good emitters of thermal/ infra-red radiation

8. Possible examination style questions answers
Why is it better to use a cube rather than four separate containers?
ANSWER:
Ensures the temperature of the water behind each surface is the same
Increases the reliability of the data

9. Key questions: Why are buildings in hot countries often painted white?
Why are the surfaces of solar water heaters often painted black?
To test the effect of the nature of the surface for several absorbers or radiators, what other factors do you have to control?
Explain why it would be a good idea to paint radiators in a house black.
Why use a Leslie Cube rather than four different cans?

10. Summary document
A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. It includes practical methods and other potential examination questions