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Multiple Choice Questions
1. When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,
(A): α = 1, ρ = 0 and τ = 0
(B): α = 0, ρ = 1 and τ = 0
(C): α = 0, ρ = 0 and τ = 1
(D): α + ρ = 1 and τ = 0
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