Answer to Question #290662 in Physics for JAY KIN

Question

    An athlete is sitting unclothed in a locker room whose dark walls are at a temperature of 15^oC. Estimate the rate of heat loss by radiation, assuming a skin temperature of 34^oC and e = 0.70. Take the surface area of the body not in contact with the chair to be 1.5 m².

       σ = 5.67 x 10^-8 W/m².K⁴

Answer 1

By Stephan-Boltzman law:

$$q=e\sigma A(T_1^4-T_2^4)=119\text{ W}.$$