The co-efficient of absorption and the coefficient of reflection of a thin uniform plate are 0.77 and 0.17 respectively. If 250 kcal of heat is incident on the surface of the plate, the quantity of heat transmitted is

Step-by-step solution

For any surface, the coefficients of absorption a , reflection r , and transmission t satisfy the conservation relation a + r + t = 1 . Given a = 0.77 and r = 0.17 , the transmission coefficient is determined as t = 1 - 0.77 - 0.17 = 0.06 . The transmitted heat equals the product of the transmission coefficient and the incident heat: Q_ transmitted = t Q_ incident = 0.06 250 kcal = 15 kcal . Final answer: 15 kcal