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Problem 1: The electron energy near the top of the valence band in a semiconductor is given by
ε = -10-37k2J
where k is the wavevector. An electron is removed from the state
k = 109k^xm-1
where k^x is a unit vector along the x axis. Calculate (a) the effective mass, (b) the energy, (c) the momentum and (d) the velocity of the resulting hole.
Problem 2. Indium antimonide has dielectric constant ε = 17 and electron effective mass mc = 0.014m. Calculate:
(a) the donor ionization energy,
(b) the radius of the ground state orbit, and
(c) the donor concentration at which orbits around adjacent impurities begin to overlap. What effects occur at about this concentration, and why?
Problem 3. Use the data to estimate a value of the donor ionization energy for arsenic Impurities in germanium.
Earth's atmosphere is constantly bombarded by cosmic ray protons that originate somewhere in space. If the protons all passed during the atmosphere, each square meter of Earth's surface would intercept protons at the average rate of 1330 protons per ..
Typical household currents are on the order of a few amperes. find how many electrons per second pass through it
a 40 cm diameter loop is rotated in a uniform electric field until the position of maximum electric flux is found. the
An object is placed 100 cm in front of a diverging lens of focal length -25 cm. A converging lens of focal length 33 1/3 cm is placed 30 cm past the first lens. What is the lateral magnification of this system of lenses? Show work for full credit.
When 50-ml of a liquid is heated through 20 degree centigrade, its apparent expansion was 0.5 ml. If the coefficient of linear expansion of the container is 9 x 1/1000000 per K, find the coefficient of real expansion of the liquid.
Two wires are separated by 3.0 cm and each is of length 1.5 m. They repel each other with a force of 4.0 N. The current in one wire is 5.0 A. find the current in the other wire
A series circuit consisting of an unchanged 2.0 µF capacitor and a 10-Mega ohms resistor is connected across a 100 Volt power source. Find the current in the circuit and the charge on the capacitor
A golf ball is dropped from rest from a height of 9.50 m. It hits the pavement, then bounces back up, rising just 5.50 m before falling back down again. A boy then catches the ball when it is 1.30 m above the pavement. Ignoring air resistance, cal..
A rocket is used to place a synchronous satellite in orbit about the earth. Calculate the speed of the satellite in orbit
A boy of mass 30.3 kg, jumps off a diving platform2.38 m high. He lands in the water and goes under a distance1.48 m, before he stops. What is the boy's velocity when he hits the water
Do an Internet search for additional instructions if your having difficulty. Try 'How to Make a Topographic Map' in Goggle
A positive point charge Q1=2.4×105C is fixed at the origin of coordinates, and a negative point charge Q2=5.6×106C is fixed to the x axis at x=+1.5m. Discover the location of the place(s) along the x axis where the electric field due to these two cha..
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