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5 . Furnace is operating at a temperature of 1 5 0 0 K and is emitting radiation uniformly in all directions. The walls of

5 .

Furnace is operating at a temperature of

1500

K and is emitting radiation uniformly in all directions. The walls of the furnace are at a temperature of

1000

K and are perfectly absorbing

.

Calculate the rate of heat transfer per unit area from the furnace walls.

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