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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?
an airplane is flying due south at 500 miles per hour at 35000 feet altitude straight and horizontally. a second
Hot coffee of temperature T[infinity] = 90°C is poured into a cup whose wall is initially at the temperature Ti= 10°C. The porcelain wall of the cup is 0.5 cm thick. The heat transfer coefficient between the coffee and the wetted surface is h= 700 W/..
question helpquestion 1 determine the headwater depth of a 1000 mm high by 1500mm wide concrete box culvert operating
calculate the air temperature and pressure at the stagnation point right in front of a meteorite entering the
liquid methanol is pumped from a large storage tank through a 1.256 inch id pipe at a rate of 3.00galmin.a at what rate
A car and a high -speed trian at constant speeds. three seconds after the train passes under the highway bridge the car crosses the bridge.
at a pumped storage facility water is pumped from a large reservoir to a point 150 feet above the resevoir. how many
a closed rgid tank contains 3kg of saturated water vapor initially at 140c. heat tranfer occurs and the pressure drops
consider the ocean thermal energy conversion system given in the lecture notes. also take into consideration that
refrigerant-134a at 800 kpa and 25 degree c is throttled to a temperature of -20 degree c. determine the pressure and
surface geostrophic velocity 0.5 ms density 1026kgm3 gravity 9.8ms ring radius 50km. you take velocity measurment
Outdoor air leaks into a building through cracks in the walls at the rate of 700 m3/h (this is infiltratation). The outside air is at a temperature of -16.1C and a humidity ratio of 0.001 kgv/kga. The density of the outside air is1.4 kg/m3. The indoo..
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