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1. How many electrons can be trapped at the heterojunction described by the triangular potential in the earlier problem with only the lowest subband occupied? Roughly how cold must the sample be for thermal occupation of higher subbands to be negligible?
2. A quantum dot is confined in two dimensions by a parabolic potential that rises 50 meV over a radius of 100 nm. Confinement is much stronger in the third dimension, and it can be assumed that all electrons remain in the lowest state for this dimension. How many states are occupied if the Fermi level lies 12 meV above the minimum? How would the results differ if the dot were instead modelled with a hard wall at 50 nm radius?
IN A VEEERTICAL JUMP AND REACH TEST A 60 KKG SSSTUDENT JUMPS 60CM, WHILE A 90 KG STUDENT JUMPS 45 CM. WHICH JUMPEER WAS MORE POWEERFUL
You have a pure (24-karat) gold ring with mass 17.8 gram. Gold has an atomic mass of 197 g/mol and an atomic number of 79. Compute what is their total positive charge
a child swings a mass on a string in a horizontal circle 1.2 meter off the ground. The string has a length of 0.6 meters, how far will the mass travel before it lands
Citing our textbook material, explain how the sociological approach toward social problems differs from other approaches. Why are certain problems considered significant and others are not? 2) Next, choose one social problem that exists in society th..
One cycle contains two processes for an air piston-cylinder device. The first process is an isothermal process and the second process is a polytropic process (PV1.2=const). Through the first process, 0.15kG of air is expanded from 2Mpa and 350°C t..
Two students on roller skates stand face-to-face, then push each other away. One student has a mass of 99 kg and the second student 68 kg. Find the ratio of the magnitude of the first student's velocity to the magnitude of the second student's veloc..
in the bohr theory of the hydrogen atom an electron moves in a circular orbit about a proton assume the radius of the
q1. how many 104 w lightbulbs can you use in a 134 v circuit without tripping a 14 a circuit breaker? the bulbs are
A 2.70kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 0.0300m. The spring has force constant 835N/m. What is the speed of the block when it has moved a distance of 0.0160m from its initial position
A uniform meter stick is freely pivoted about the 0.20-m mark. If it is allowed to swing in a vertical plane with a small amplitude and friction, what is the frequency of its oscillations
An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. What is the mass of this canister
An oil drop carries one excess electron and weighs 9.3 x10-15 N. What electric field strength is needed to suspend the drop so it is motionless.
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