點解blackened theromometers 可以detect到infrared radiation?? 點解要blackened??
- 天同Lv 71 decade agoFavorite Answer
A good radiator of heat is also a good absorber of heat.
Because black surface object, when heated, will emit radiation of all possible wavelengths (The black-body radiation principle).
A black surface thus absorbs radiation of all wavelengths, including visible and infrared radiation.
The temperature so recorded by the thermometer is called the [Radiation Temperature], it is used to indicate the radiant energy emitted by the surrounding environment.