Edexcel IGCSE Physics 4.8 Radiation Emission and Absorption Questions

Practise predicting how black, white and shiny surfaces absorb, reflect or emit infrared radiation in heating and cooling contexts.

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

[Maximum number: 2]

The photograph shows infrared heating lamps being used to harden fresh paint on a car.

Figure for Question Edexcel IGCSE Physics 4.8 Radiation Emission and Absorption Questions question 1 — Edexcel IGCSE Physics

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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Edexcel IGCSE Physics 4.8 Radiation Emission and Absorption Questions question 1