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Calculate intrinsic carrier concentrations in Ge at temperatures 293 K (room temperature). J73 K (boiling point of water), and 253 K (wittier in Minnesota). Compare the results and formulate conclusions about the temperature dependence of carrier concentrations in this temperature range. In your calculations, assume that the effective masses of electrons and holes in Ge coincide with the electron mass at rest. The band gap in tie is 0.67 eV.
A copper rod of cross-sectional area 11.2 cm2 has one end immersed in boiling water and the other in an ice-water mixture, which is thermally well insulated except for its contact with the copper. How many grams of ice melt each second
High speed stroboscopic photographs show that the head of a 181 g golf club is traveling at 55.4 m/s, Find the speed of the golf ball just after impact
A typical nuclear reactor generates 1000 MW of electrical energy. In doing so, it produces "waste heat" at a rate of 2000 MW and this heat must be removed from the reactor. How many kilograms of cooling water have to be pumped through the reactor e..
How much thermal power is radiated by a light bulb when its filament is heated to 2000°C? Assume that the filament is a blackbody of area 1.0 cm2
A 2.5 kg piece of the same metal, intitally at a temperature of 190°C is dropped into the water. If the water temperature rises from 16.0°C to 17.8°C, calculate the specific heat of the metal.
A laser with wavelength d/8 is shining light on a double slit with slit separation 0.450 mm. What is the wavelength of the second laser
A 3.40-kg object is attached to a spring and placed on frictionless, horizontal surface. Find the maximum acceleration of the object
The rest energy of an electron is 0.511 MeV. The rest energy of a proton is 938 MeV. Assume both particles have kinetic energies of 1.80 MeV. (a) Find the speed of the electron. c (b) Find the speed of the proton. c
15 points A block of mass 5.00 kg is pushed from a height of 2.00m inside of a frictionless circular hoop of radius 2.00m. What is its speed at the lowest point
A fan at a rock concert is 50.0{\rm m} from the stage, and at this point the sound intensity level is 109{\rm dB}. How much energy is transferred to her eardrums
A group of hikers hear an echo 2.50 s after they shout. If the temperature is 28°C, how far away is the mountain that reflected the sound wave.
procedures in the physical sciences challenges in measurementsidentify three specific challenges to making direct
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