#### Question

Calculate the amount of heat radiated per second by a body of surface area 12 cm^{2} kept in thermal equilibrium in a room at temperature 20°C. The emissivity of the surface = 0.80 and σ = 6.0 × 10^{−8} W m^{−2} K^{−4}.

#### Solution

Given:

Area of the body, *A* = 12 × 10^{−4} m^{2} Temperature of the body,* T* = (273 + 20) = 293 K

Emissivity, *e* = 0.80

Rate of emission of heat, *R* = *AeσT*^{4}*R* = 12 × 10^{−4} × 0.80 × 6.0 × 10^{−8 }× (293)^{4}*R *= 0.42 J (approximately)

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Solution Calculate the Amount of Heat Radiated per Second by a Body of Surface Area 12 Cm2 Kept in Thermal Equilibrium in a Room at Temperature Concept: Heat Transfer - Radiation.