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When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body,

When α is absorptivity, ρ is reflectivity and τ is transmissivity, then for a diathermanous body, Correct Answer α = 0, ρ = 0 and τ = 1

Diathermanous body is a body which transmits all the incident radiation without absorbing or reflecting.
(A body with transmitivity 1, reflectivity 0 and absorptivity 0) Air, up to certain extent can be considered as the diathermanous body because, it transmits all the radiation without hearing itself.

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