Explain how the black body radiation curve is useful in defining the colour temperature of a light source.
Answers
According to Wikipedia – The color temperature of a light source is the temperature of an ideal black-body radiator that radiates light of comparable hue to that of the light source.
A black-body radiator is any object which fully absorbs all frequencies of light, just as a white body is any object which fully reflects all frequencies of light. Black-body radiation (according to Wikipedia) is the type of electromagnetic radiation (light) emitted by a black body (an opaque and non-reflective body) held at constant, uniform temperature. The radiation has a specific spectrum and intensity that depends only on the temperature of the body.
In other words, the hue (color or specific spectrum) of light emitted by a black body radiator is determined by its temperature.
The sun or a tungsten incandescent filament lamp are both examples of near perfect black body radiators.
The temperature of the black body radiator is measured in degrees Kelvin and therefore, the color (specific spectrum) of light emitted by a black body radiator can be determined by its temperature in degrees Kelvin.
This can—and has been—mapped onto a chromaticity diagram, forming a curve called Planckian locus.
I heard that while being blue in colour it means that object is cold.The red one is hot