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1. How many intrinsic electrons and holes are there in a thermal de Broglie cube at 300K in Si corresponding to an energy equal to kBT? What is the thermal fluctuation in carrier density In this cube? Can the intrinsic electrons be localized?
2. The binding energy of an electron trapped to the substitutional As donor in Si was measured spectroscopically (infra-red absorption at T=4.2K) in 1965 by Prof. Ramdas and his graduate students at Purdue and found to be 53.69meV.
Assume that the static dielectric constant is valid for screening the As ion charge by the valence electrons and is given by ε1/ ε0 = 01.8. What is the orbital radius of an electron trapped at the ground state by As?
How many valence electrons are enclosed in the Bohr sphere or in the spherical volume enclosed by the trapped electron orbit? Is the assumption on the static dielectric constant reasonable and why?
A 2.00-ton automobile is parked at the top of a hill that is 100ft high and inclined 25 degrees with respect to the horizon. find the automobile velocity (ft/s) at the bottom of the hill
What are the x and y acceleration components of a 5 kg particle subject to Force 1 (F1x = 4.6 N and F1y= -2.1 N) and Force 2 (F2x=-2.8 N and F2y= 5 N)
A bat flying in a cave emits a sound and receives its echo 0.37s later. How far away is the cave wall? (Hint: The sound has to travel to the wall and then back again. Use 340 m/s for the speed of sound.)
A light beam traveling through air, enters a slab with n= 2.50 at a 45º angle with respect to the normal, At what angle to the normal does the ray leave the slab
The potential difference among two parallel conducting plates in vacuum is 550 V. An alpha particle with charge of 3.20×10-19 C and mass of 6.50×10-27 kg is released from rest near the positive plate. What is the kinetic energy of the alpha particle ..
A 12.0-m long conveyor belt, inclined at 30.0°, is utilized to transport bundles of newspapers from the mailroom up to the cargo bay to be loaded on to delivery trucks. Each newspaper has a mass of 1.0 kg, and there are 25 newspapers per bundle. Deci..
A Space Ship is very deep in space, it stars from rest and firesits engine. After 10 seconds, the engine shuts off. Describe themotion of the ship after the engine shuts off?
A weightlifter lifts 50 kg a total vertical distance of 0.28 m at a constant speed in 1.00 seconds. What power was exerted
A single-turn current loop, carrying a current of 5.67 A, is in the shape of a right triangle with sides 62.8, 114, and 130 cm. The loop is in a uniform magnetic field of magnitude 64.6 mT whose direction is parallel to the current in the 130 cm s..
An electron with speed v0 =4.16×106m/s is traveling parallel to and along the same direction as an electric field of magnitude E = 7.90×103N/C, How far will the electron travel before it stops
To monitor the breathing of a hospital patient, a thinbelt is girded around the patient's chest. The belt is a233 turn coil. When the patient inhales,the area encircled by the coil increases by 39.0 cm2.
What is the escape speed on a spherical asteroid whose radius is 804 km and whose gravitational acceleration at the surface is 0.943 m/s2
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