When α is absorptivity, ρ is reflectivity and τ is transmissivity, 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
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.
