railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Radiation Absorptivity, Reflectivity and Transmissivity
For an opaque surface, the absorptivity (α) , transitivity (τ) and reflectivity (ρ) are related by the equation
1
α + ρ = τ
2
ρ + α + τ = 0
3
α + ρ = 1
4
α + ρ = 0