Black Body Radiation
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Key Stage 4
Meaning
Black body radiation is the electromagnetic radiation given off by all objects with a temperature above absolute zero (0 Kelvin or -273°C).
About Black Body Radiation
- All objects emit electromagnetic waves.
- The frequency of electromagnetic wave depends upon the temperature of the object. The higher the temperature the higher the frequency of electromagnetic wave.
- The Sun emits visible light because its temperature is so high.
- Objects at room temperature emit Infra-red radiation. This can be seen using a thermal imaging camera.
- The colour of an object affects the rate at which it absorbs or emits infra-red radiation. Dark colours both absorbs and emit infra-red radiation more quickly than light colours.
- Reflective surfaces emit the least black body radiation.