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As a mechanism for downward trans1t10ns, spontaneous emission competes with thermally stimulated emission (stimulated emission for which black body radiation is the source). Show that at room temperature ( T = 300 K) thermal stimulation dominates for frequencies well below 5 x 1012 Hz, whereas spontaneous emission dominates for frequencies well above 5 x 1012 Hz. Which mechanism dominates for visible light?
A large manufacturing space with an average floor to ceiling height of 30 ft has a floor area of 5000 ft^2. The total infiltration rate for the space is estimated to be 1.5 air changes per hour. The inside design temperature and relative humidity are..
The die characteristic is Q_x = 0.0015p where p is the head pressure in psi. Determine the flight angle that maximizes the flow rate Q_x and graph it.
air at 1175k 8 bar enters a turbine operating as steady state and expands adiabatically to an exit state of 1 bar. the
a piston-cylinder containing 1 kg air at 500degc and 500 kpa is connected to a carnot heat engine where the environment
An amount P must be invested now to allow withdrawals of $1,000 per year for the next 15 years and to permit $300 to be withdrawn starting at the end of year 6 and continuing over the remainder of the 15-year period as the $300 increases by 6% per ye..
water with a density of 62.4 lbmft3 enters a 36 diameter cylindrical container at 85 gpm. water is allowed to exit the
you have a refrigeration plant that makes ice in the summer to supply grocery stores. you maintain the cold room where
0.5 kg of air, contained inside a piston-cylinder device, with an initial pressure of 6 bar and initial volume of 0.15 m3 undergoes a thermodynamic cycle consisting three processes as follows:
motion with wind stress rotation and friction in the following you may use these values if neededmiddot density
A power plant generates steam from coal burning which burns at 3,000oF and produces about 13,000 BTU per pound. The steam is put into a poorly insulated turbine which allows 2,000 BTU per pound of coal to escape to the atmosphere at 90oF. Knowing the..
as shown in the figure steam at 1200 psia 825degf enters a turbine operating at steady state with a volumetric flow
an ideal gas undergoes a thermodynamic cycle consisting of three processesprocess 1-2 isothermal compression from p1
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