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A GaAs quantum well structure is given where a thin GaAs layer is embedded between AlGaAs layers. Assuming the we can treat the electrons in the GaAs conduction band as being trapped in a 1-D potential well in the x direction,(a) What is the form of the density of states in this in the x-direction?(b) If we have a quantum well structure as depicted below, what would be the first two energy levels for a quantum well of thickness of 10 nm? The electron mass isme = 0.07 mo .(c) What is the hole energy below EV of the sample is mh = 0.5 mo ?(d) What would be the change in emission wavelength in the quantum well structure from bulk GaAs (1.42 eV)?
A 3.8uC charge is at the center of a cube 7.0cm on each side. What is the electric flux through one face of the cube
A wire carries a current of 0.665 A. This wire makes an angle of 55.5° with respect to a magnetic field of magnitude 4.92E-5 T, What is the length of the wire
A 12 kg runaway grocery cart runs into a spring with spring constant 300 N/m and compresses it by 70 cm.What was the speed of the cart just before it hit spring.
a vehicle covers 600m on a compass bearing of 47 degrees,then 500m bearing 128 degrees; Determine the resultant displacement of the vehicle
A particle of mass M is at rest at x=1. The potential energy is given by U=-Ax+C. Assume that the force associated with U is the only force acting on the particle. Find the force acting on the block
A defibrillator consists of a 16.7-µF capacitor that is charged to 9.0 kV. how much charge passes through the body tissues
An electron and a anti-electron (Positron) circle eachother at a distance of 1.00x10^-19m. What is the electrostatic force between the particles? What is the potential energy of the system? Is this energy positive or negative?
A particular ideal solenoid has 1200 turns/m, a radius of 10 cm, and a current of 4.0 A. What is the maximum speed the electron can have if it is not run into the side of the solenoid
The ball has the speed of 12.1 m/s and is moving in a direction of 33.4 degrees east of north, relative to the ground.
Light is reflected from a glass coffee table. When the angle of incidence is 50.0°, What is the index of refraction of the glass
Consider the collision between two hockey pucks in the figure below. They do not stick together. Their speeds before the collision are v1i = 30 m/s and v2i = 11 m/s. What is the final velocity of the other puck
Two objects attract each other gravitationally with a force of 2.5 * 10^-10N when they are .25m apart. There total mass is 5.00kg. Find their individual masses
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