Explain about cavity and cavity radiation.
Answers
Answer:
Cavity radiation refers to an object or system which absorb all radiation incident upon it re-radiates energy which is characteristics of this radiating system only, not depend upon the tyoe of radiation which is incident upon it.
Answer:
A cavity radiator is a block of material with internal cavity. The inner and outer surface of the block are connected by a small hole. Most of the radiant energy entering the block through the hole cannot escape from the hole. The block, therefore, acts almost like a blackbody.
When the cavity radiator is heated to high temperature, radiation coming out from the hole resembles blackbody radiation. It is called cavity radiation. It depends only on the temperature of the radiator and not on the shape and size of the cavity as well as the material of the walls of the cavity