Black Body Radiation — GCSE Physics Revision
Revise Black Body Radiation for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Lenses & ImagesWhat is Black Body Radiation?
A black body is a theoretical object that absorbs all radiation that falls on it. It does not reflect or transmit any radiation, making it a perfect absorber. A perfect black body is also the best possible emitter of radiation. The intensity and wavelength of the radiation emitted by a black body depend on its temperature.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). This topic is important for understanding the greenhouse effect and the life cycle of stars.
Step-by-step explanationWorked example
A hot piece of charcoal glows red. As it gets hotter, it starts to glow white. Explain this in terms of black body radiation. Solution: As the temperature of the charcoal increases, it emits more radiation at all wavelengths. The peak wavelength of the emitted radiation also shifts to a shorter wavelength. This is why it goes from red hot to white hot (which is a mixture of all visible colours).
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Common mistakes
- 1Thinking that a black body must appear black. A black body emits radiation, and if it is hot enough, it will glow. The Sun is a good approximation of a black body.
- 2Confusing the absorption and emission of radiation. A good absorber is also a good emitter.
- 3Forgetting that all objects emit and absorb thermal radiation. The net transfer of energy depends on the temperature difference between the object and its surroundings.
Black Body Radiation exam questions
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Black Body Radiation
Core concept
A black body is a theoretical object that absorbs all radiation that falls on it. It does not reflect or transmit any radiation, making it a perfect absorber. A perfect black body is also the best pos…
Frequently asked questions
What is a perfect black body?
A perfect black body is an object that absorbs 100% of the radiation that hits it. It is a theoretical concept, but stars and other hot, dense objects are good approximations.
How does temperature affect black body radiation?
A hotter object emits more radiation at every wavelength than a cooler object. The peak of the emission spectrum also moves to shorter wavelengths as the temperature increases.