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Calculate the total number of state between the first energy level and the second energy level for a quantum well of thickness 25 Angstrom and an erea of 1mm^2. Given that the energy difference between the first 2 energy levels is 0.3 eV, the effective mass of electron in the quantum well is 0.067m, and m is the free electron mass.
A stone is dropped into a well. The sound of the splash is heard 1.80 s later. What is the depth of the well
A grating has exactly 8000 lines uniformly spaced over 2.58 cm, What is the expected angle for the third-order maximum of the green line
assume four objects each of mass m are placed at the corners of a square os side length, How much work is needed to separate the planets so that they are infinitely away from each other
A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. What is the mass of the wheel
The ammonia molecule NH3 has adipole moment of 4.8e-30 C·m. Ammonia molecules in the gasphase are placed in a uniform electric field with magnitude 1590000N/C. What is the change in electric potentialenergy when the dipole moment of the molecule c..
question1a hunter aims straight at a target on the same level 130 m away.a if the bullet leaves the gun at a speed of
On an essentially frictionless, horizontal ice rink, a skatermoving at 2.0 m/s encounters arough patch that reduces her speed by 49% due to a friction force that is 26% of her weight. Use the work—energy theorem to find the length of this rough pa..
Steel Piano string, The lowest note on a grand piano has a frequency of 27.5 Hz. The string is 2 m (more or less; let's just assume it is exactly 2.000 m) long, and its tension is 1000 N (again, more or less, so let's say it's exactly 1000 N).
A beam of red laser light (? = 633 nm) hits a black wall andis fully absorbed. If this exerts a total force of F = 5.5 nNon the wall, how many photons per second are hitting the wall
A 7.7cm diameter horizontal pipe gradually narrows to 6.7cm . When water flows through this pipe at a certain rate, What is the volume rate of flow
A ball is thrown upward with a speed of 10m/s relative to aballoon that is 50m above the ground while it is moving downwardwith a speed of 5m/s. How long does the object take to hit the ground
A laser beam is projected through a diffraction grating which has a slit to slit separation of 2 microm (5000 lines/cm). What is the wavelength of the laser
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