If an athermanous body absorbs 20% of the incident radiant energy, then reflection coefficient of the body is

Athermanous bodies are those

Athermanous bodies are those

Given that p joule of heat is incident on a body and out of it q joule is reflected and transmitted by it. The absorption co-efficient of the body is :

A good reflector absorbs lots of radiant energy.

Out of 10J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 7 J. Then, coefficient of transmission of the body is

Out of 10J of radiant energy incident on a surface, the energy absorbed by the surface is 2 J and the energy reflected is 7 J. Then, coefficient of transmission of the body is

Define athermanous body.