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Question: The amount of thermal radiations emitted from one square centimeter area of a black body in one seco...

The amount of thermal radiations emitted from one square centimeter area of a black body in one second when at a temperature of 1000 K is –

A

5.67 J

B

56.7 J

C

567 J

D

5670 J

Answer

5.67 J

Explanation

Solution

12LK1A+LK2A\frac{12}{\frac{L}{K_{1}A} + \frac{L}{K_{2}A}} = ΔTALK1A\frac{\Delta T_{A}}{\frac{L}{K_{1}A}}

K1 = K22\frac{K_{2}}{2}