engineering recuitment Vizag Steel MT Mechanical 2020 Test Series Heat Transfer Radiation

Which one of the following is true for black body

1
τ = 1, α = ρ = 0
2
α = 1, ρ = 0, τ = 0
3
ρ = 1, α = τ = 0
4
α + τ = 1, ρ = 0
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