Discussion
For an opaque surface, the absorptivity (α), transmissivity (τ) and reflectivity (ρ) are related by the equation:
Answer: C
For an opaque surface, \(\alpha+\rho=1\).
Radiation falling on any surface is absorbed, reflected or transmitted, so the three fractions add up to one:
\[ \alpha+\rho+\tau=1 \]
An opaque surface transmits nothing, so \(\tau=0\) and the relation reduces to \(\alpha+\rho=1\).
The fractions are each between 0 and 1, so their sum can never be zero, which rules out both options ending in 0. \(\alpha+\rho=\tau\) would mean the surface transmits as much as it absorbs and reflects together, which contradicts both the energy balance and the meaning of opaque.
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