infrared radiation既問題

Question

點解blackened theromometers 可以detect到infrared radiation?? 點解要blackened??

Answer 1

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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.