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Assume that electron-hole pairs are injected into n-type GaAs (Eg = 1.42 eV, mc = O.O7m0, mv= 0.5m0,) at a rate R = 1O^23 per cm3 per second. The thermal equilibrium concentration of electrons is n0 = 10^16 cm^3. If the recombination coefficient r = 10^-11 cm^3/s and T = 300 K, determine:
(a) The equilibrium concentration of holes p0.(b) The recombination lifetime t.(c) The steady-state excess concentration delta n(d) The separation between the quasi-Fermi levels Efc - Efv, assuming that T = 0 K
The angular velocuty of the elctron in the lowest Bohr orbit of the hydrogen atom is about 4*10^16 s^-1. Determine the Larmor frequency in a field of 2 T
A 270-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 40° with the horizontal. What is the angular speed of the sphere at the bottom of the slope
What is the force of friction exerted on the backpack by the table?
A 98 ? resistor is connected in series with a 177 mH inductor and a 1.4 ?F capacitor. Find the effective voltage Vrms across the capacitor
At its highest temperature, a space heater has a resistance of 31.5 ? when it is plugged into a wall outlet supplying a peak voltage of 169.7 V sinusoidally at 60 Hz
What is the volume of the bubble when it reaches just below the surface of the lake, where temperature is 20°C.
a person pulls a crate with 120 n of force against 100 n of friction a distance of 5 meters. sketch a free body diagram
Suppose a bat uses sound echoes to locate its insect prey, 3.00 m away. What is the percent uncertainty does this cause for the bat in locating the insect
If the initial temperature of the horseshoe is 450 °C, and the initial temperature of the water is 45° C, what is the equilibrium temperature of the system? Presume no heat is exchanged with the surroundings.
a starship departs for the triple star system of Alpha/Proxima Centauri which is 4.30 LY from earth. what will be the reading of the clocks back on earth
The spaceship Lilac, based on the Purple Planet, is 791 m long, as measured at rest. When Lilac passes Earth, Terran observers measure its length to be 733 m.
A positive charge of Q = 5.40 uC is fixed in place. From a distance of ri = 4.20 cm a particle of mass m = 5.50 g, What is the minumum distance rf between the two charges
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