A good emitter is also a good absorber (Kirchhoff’s law of radiation). The blackened surface is An excellent emitter as well as an excellent absorber. If the same surface is silvered, it becomes a bad emitter and a bad absorber. A black body is one that absorbs all radiant energy falling on it.

Why is a good absorber a good emitter?

Before Kirchhoff’s study, it was known that for Total thermal radiation, the ratio of the emitted power to the absorption ratio of all objects that emit and absorb thermal radiation in thermodynamic equilibrium is the same. This means that a good absorber is a good transmitter.

Is a poor absorber a good transmitter?

malabsorptive The transmitter is also poorand does not emit radiation as quickly as darker colors.

Is a good heat sink also a good radiator?

A good heatsink will radiate more energy than a normal heatsink at a given temperature Poor radiatorand being a poor absorber, it will absorb less.

What are good and bad launchers?

A good emitter of IR (infrared) radiation is also a good absorber. matt, black finish are the best emitters and absorbers; shiny, light-colored surfaces are the worst — the brighter and brighter the surface, the more light it reflects.

Why dark bodies are better absorbers and transmitters? CBSE Class7 Science Online Course

42 related questions found