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

Question

Depending on the radiating properties, a body will be black when (Where α = absorptivity, ρ = reflectivity, τ = 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 α, and reflection ρ. Depending on the radiating properties, a body will be black when ρ = 0, τ = 0 and α = 1.

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

? = 0

? = 0 and ? = 1

? = 0

? = 0 and ? = 0

? = 1

? = 0 and ? = 1

? = 0

? = 1 and ? = 1

The correct answer is `No. 1: ? = 0`

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

? = 0

? = 0 and ? = 1

? = 0

? = 0 and ? = 0

? = 1

? = 0 and ? = 1

? = 0

? = 1 and ? = 1

The correct answer is No. 1: ? = 0

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

The correct answer is `No. 1: ? = 0`