Infrared
2 marks · EasyA person checks their home for heat loss using an infrared camera. Explain why the camera is able to identify areas losing heat.
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Areas losing more heat emit more infrared radiation, which the camera detects and displays as brighter or hotter regions.
Also accept: Infrared cameras detect different amounts of infrared emitted by warm and cool areas, showing temperature differences.
Common mistakes: Infrared cameras work by detecting visible light.; Cameras only see through walls.
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Marking points
B1 · 1 mark · Explains areas losing heat emit more infrared.
B2 · 1 mark · States camera detects and records these infrared differences.
Worked solution
As heat escapes, those areas emit more infrared radiation. The camera picks up these higher emissions and displays them as bright spots, so the person can see where the most heat is lost.