Asmall circular plate has a diameter of 2 cm and can be approximated as a blackbody. to determine the radiation from the plate, a radiometer is placed normal to the direction of viewing from the plate at a distance of 50 cm. if the radiometer measured an irradiation of 129 w/m2 from the plate, determine the temperature of the plate. take the stefan-boltzmann constant as σ = 5.67 x 10-8 w/m2·k4.the temperature of the plate

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?