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Estimate the spacing of the energy levels for electrons and holes (both light and heavy), and the optical transition energies, for the sample shown in Figure 4.5. Make the obvious approximation that the parabolic potential continues upwards, rather than stopping when it reaches the maximum imposed by the bands of the AlGaAs; this should be adequate for the lowest levels. Ignore also the variation in effective mass through the heterostructure.
You throw it upward at an angle of 70 degrees and your teammate catches it at the top of their jump. Assume the ball and your teammate start at the same height, and your teammate jumps with an initial upward speed of 3.5 m/s. How fast must you thr..
Two identical 30 {rm g} particles each carry 3 {rm mu C} of charge. One is held fixed, and the other is located 1 {rm mm} away and released. Find the speed of the moving charge when it's 1{rm cm} from the fixed charge.
A very long, straight solenoid with a cross-sectional area of 6.15 is wound with 30 turns of wire per centimeter, compute the average induced emf in the secondary coil
After the collision, the speed ofM1is reduced to 0.441 m/s, and it is moving to the left and downward at an angle of 32.0° with respect to the horizontal. You cannot assume that the collision is elastic. What is the speed of M2 after the collision..
A solid disk of mass M and radius R is pivoted so that it can rotate about its center. The disk is initially at rest. A ball of mass m and speed v travels along a path tangential to the rim of the disk.
The lowest pedal note on a large pipe organ has a fundamental frequency of 16 Hz, What is the length of the open-closed pipe that makes that note
Replace the parallel force system acting on the plate by a resultant force. Suppose that F1 = 4 kN , F2 = 8.9 kN , and F3 = 5 kN . (Figure 1)
Two laser beams fall on a screen and illuminate small circular areas. What is the minimum distance between the centers of the circles in order for an observer
An athlete starts at point A and runs at a constant speed of 6m/s around a round track 100 m in diameter, what is x component of this runner's average velocity between points A and B.
Using ground-based telescopes or the Hubble Space Telescope, astronomers take photographs of galaxies which are many light years from the Earth. Does it mean those photographs are as old as the galaxies are far from the Earth?
A converging lens of focal length f1=11.0 cm is placed 52.0 cm to the left of a converging lens of focal length f2 = 22.0 cm. What is the overall magnification of the lens combination
a 0.060 kg tennis ball moving with a speed of 7.60 ms has a head-on collision with a 0.080 kg ball initially moving in
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