Question 711: Thermodynamics & KTG

Question

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

Accepted Answer

Given:
Coefficient of absorption, $a = 0.77$
Coefficient of reflection, $r = 0.17$
Incident heat, $Q = 250$ kcal
We know that:
$ a + r + t = 1 $
where $t$ is the coefficient of transmission.
Step 1: Find the coefficient of transmission
$ t = 1 - (a + r) $
$ t = 1 - (0.77 + 0.17) $
$ t = 1 - 0.94 $
$ t = 0.06 $
Step 2: Find the heat transmitted
Transmitted heat = $t 	imes Q$
$ 	ext{Transmitted heat} = 0.06 	imes 250 $
$ 	ext{Transmitted heat} = 15 	ext{ kcal} $
Final Answer:
Option C: 15 kcal

Answer

7 kcal

Answer

12 kcal

Answer

15 kcal

Answer

22 kcal

Thermodynamics & KTG

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

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