Gate ME-2012 Question Paper With Solutions

Q 6.  For an opaque surface, the absorptivity (a), transmissivity (t) and reflectivity (r)
are related by the equation :

(A) a + r = t

(B)r + a + t = 0

(C) a + r = 1       

(D) a + r = 0

Answer: (C)

Explanation: