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(a) (i) What are the main assumptions of the free electron model?
(ii) Give an example where the free electron model is in good agreement with experiment.
(iii) Give an example where the free electron model fails.
(b) (i) How does the nearly free electron model improve on the free electron model?
(ii) Describe one of the successes of the nearly free electron model over the free electron model.
(c) Calculate the mean free path in copper for which Kf, the k-vector of electrons at the Fermi energy is 1.35 10^10 m^-1, given that ζ=2.4x10^-14s
A piece of wood is 6.00 m long, 0.260 m wide and 0.060 m thick. Its density is 600kg/m cubed. What volume of iron ( P iron = 7.8 x 10 cubed kg/m cubed) must be fastened underneath the wood to sink it so that the top surface of the wood is just even w..
A 2000 kg car is slowed down uniformly from 21.0 m/s to 6.00 m/s in 5.60 s.
q1. a test rocket is launched by accelerating it along a 200.0-rm m incline at 1.57 rm ms2 starting from rest at point
a boeing 747-8 with wingspan of 65.5 m is cruising at 289 m/s over northern canada, What is the potential difference between the tips of the wings
Water is circulating through a closed system of pipes in a two floor apartment. On the 1st floor, the water has a gauge pressureof 3.4x105 Pa and a speed of 2.1 m/s.
A high diver of mass 65.0 kg steps off a board 10.0 m above the water and falls vertical to the water, starting from rest. what average upward force did the water exert on her
A typical scuba tank has a volume V of 10 liters. When fully charged, it contains compressed air at a pressure of 200 bars, or 2.0 x 10^7 Pa. What is the uncompressed volume of the air
A certain part of an aircraft engine has avolume of 1.6 ft3. Find the weight of the piece when it is made of iron
Two point charges totaling 6.10 µC exert a repulsive force of 0.140 N on one another when separated by 0.500 m. what is the charge on each if the force is attractive
A thin wire is bent into a semicircle, having a radius of curvature equal to 6.40 cm. What is the potential at the center of curvature?
A plane flies 500 km east from city A to city B in 45.0 min and then 930 km south from city B to city C in 1.50 h. In magnitude-angle notation, what is the plane's displacement for the total trip
Wingspan 64 m spread, 38 m swept Total Wing area Aw = 54.5 m2 Drag profile area Ap = 11.5 m2 Mass 27,700 kg fully loaded 2 x GE F110 Turbofan engines Thrust 61.4 kN from each engine
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