Edexcel IGCSE Physics 4.8 Radiation emission & absorption
Practise predicting how black, white and shiny surfaces absorb, reflect or emit infrared radiation in heating and cooling contexts.
- Syllabus
- First assessment 2019
- Course
- Physics 4PH1
Exam points
- choose black surfaces for solar panels or thermometers because they absorb infrared well
- explain how shiny silver or white surfaces reduce heating by reflecting infrared radiation
- sketch temperature-time curves showing a black bottle warming faster than a silver bottle
4.8 Radiation emission and absorption question 1
The photograph shows infrared heating lamps being used to harden fresh paint on a car.
Paint takes less time to harden when it absorbs more energy from infrared radiation.
A technician observes that white paint takes more time to harden than black paint.
Explain this observation.
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