Depending on the radiating properties, a body will be white when
(Where τ = absorptivity, ρ = reflectivity, x = transmissivity)

Question

Depending on the radiating properties, a body will be white when (Where τ = absorptivity, ρ = reflectivity, x = transmissivity)

RRB Paper · Accepted Answer

A body that allows heat radiation to pass through it is called a Diathermanous Body(diathermic or diathermal bodies).

A body’s behavior with regard to thermal radiation is characterized by its transmission τ, absorption x, and reflection ρ.

A white body is one for which all incident radiation is reflected uniformly in all directions:

ρ = 1, τ = 0 and x = 0

P = 0