A body of surface area 25 × 10-3 m2 emits 0.4 Kcal of heat in 20 s at 50°C. What is the emissive power of the body at that temperature?

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A body of surface area 25 × 10^-3 m² emits 0.4 Kcal of heat in 20 s at 50°C. What is the emissive power of the body at that temperature?

0.5 Kcal/m²/S

0.6 Kcal/m²/S

0.7 Kcal/m²/S

0.8 Kcal/m²/S

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The unit of Stefa’s constant is

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