A5m x 5 m × 4 m dormitory room is at 100 kpa and 20°c. a 150w fan is turned on for 4 hours inside the room. assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows. the gas constant of air is r 0.287 kj/kg-k, specific capacity c 0.718 kj/kg. k for air at room temperature. determine whether the room has been cooled down and calculate the final room temperature.

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?