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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
A 5.0-m-wide swimming pool is filled to the top. The bottom of the pool becomes completely shaded in the afternoon, How deep is the pool
A basketball player makes a jump shot. The 0.603 kg ball is released at a height of 2.07 m above the floor with a speed of 7.19 m/s. What is the work done on the ball by air resistance
A bullet of mass m= 0.0230 kg is fired along an incline and imbeds itself quickly into a block of wood of mass M= 1.30 kg. find the speed of the bullet just before it hits the wood
A white light beam shines directly on a very thin oil film that floats on water, where the incident beam normal to the surface. Find the wavelength and color of the light
Where must an object be placed to form an image 28.8 cm from a diverging lens with a focal length of 45.0 cm, Determine the magnification of the image
A hand-cranked AC generator is used to cause 0.65 A of current (rms), What is the minimum average rate at which work must be done on the generator
A3.50kg object is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of24.0N is required to hold the object at rest when it is pulled 0.200 m from its equilibrium position.
A bat at rest sends out ultrasonic sound waves at 53.5kHz and receives them returned from an object moving directly away from it, What is the received sound frequency
A second fragment, who's mass is 3.4 kg, moves away from the point of explosion with a speed of 418 m/s along the negative x axis. What is the speed of the third fragment? Ignore effects due to gravity.
A pump uses a piston of 15 cm diameter which moves 2 cm/s. What is the fluid velocity of a tube 3mm in diameter
Explain why the VOLTS/DIV knob of an oscilloscope doesn't have to be calibrated and the TIME/DIV button must be calibrated when measuring time-constants
An experiment you're designing needs a gas with ? = 1.42. You recall from your physics class that no individual gas has this value, What fraction of the molecules need to be monatomic
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