This key facts covers ⬛ What is a Black Body? within Black Body Radiation for GCSE Physics. Revise Black Body Radiation in Energy for GCSE Physics with 13 exam-style questions and 5 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 4 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 4
Practice
13 questions
Recall
5 flashcards
⬛ What is a Black Body?
Definition: A black body is a theoretical perfect absorber and perfect emitter of radiation.
- Perfect absorber: Absorbs ALL radiation that hits it (reflects none)
- Perfect emitter: Emits the maximum amount of radiation at every wavelength
- Called "black" because a perfect absorber appears black at room temperature
- Real objects approximate black bodies (e.g., soot, stars, planets)