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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?
Finding acceleration and height given two times. one rock is dropped from a height 'h' and it takes 4.15s to reach the ground from a cliff and the second rock is thrown up 2m and then takes 6.3s to reach the ground, what is the hight of the cliff?
A light ray initially in water enters a transparent substance at an angle of incidence of 43.0°, Calculate the speed of light in the transparent substance
A particle has a rest mass of 6.60 x 10-27 kg and a momentum of 2.16 x 10-18 kg • m/s. What is the kinetic energy of the particle
You have three resistors with resistance 10, 20, 30. You want to use all 3 in any kind of connection to form equivalent resistor. Calculate their equivalent resistances
A meter stick of mass 150 g is pivoted at its center. A mass m1 of 75.0 g is suspended 13.0 cm from the left end of the meter stick. How much mass m2 must be suspended 69.0 cm from the left end of the meter stick to achieve rotational equilibrium?
the membrane that surrounds a certain type of living cell has a surface area of 4.00 10-9 m2 and a thickness of 1 10-8
The Moon's diameter is 3.5 x 103 km, and its distance from Earth is 3.8 x 105 km. The image is formed by the Hale Telescope reflecting mirror, which has a focal length of +16.9 m. Determine the distance from the image to the mirror. Express your a..
At the Earth's surface, a projectile is launched straight up at a speed of 9.6 km/s. Calculate to what height will it rise
Alpha Centauri is 4.3 light years away. If we could make a rocket that went 4/5 the speed of light: What would the travel time be for the astronauts
Confirm that the total number of nucleons and total charge are conserved in this reaction.
Tobogganed coasts down a hill and then goes over a slight rise by speed 1.5 m/s. The top of this rise can be taken to be a circle of radius 3 m. The toboggan and occupant have a combined mass of 110 kg.
If they are released from rest and allowed to fall toward one another, what is their speed when they first make contact?
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