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The indium acceptor in Si, (ET-Ev)-270mV, was used as 4-micron infrared detector in satellite and space-craft applications since there is a atmospheric absorption window around this wavelength. The absorption cross section is about a Bohr radius of trapped hole. 10-16cm2. The solubility of indium in silicon crystal is about 1016cm-3.
The infrared photon flux is 1014cm-2s-1. How long would it take to detect 100 photons using an indium detector of 1 cm2area?
A 7000-kg truck starts to roll down aroad with a 30 degree incline. People rush to stop it. How much force must they apply to stop it
Assume that a binary star system consists of two stars of equal mass. They are observed to be separated by 310 million kilometres and take 4.0 Earth years to orbit about the point midway between them.
Suppose each of the object's three dimensions is increased by a factor of 3 without changing the material od which the object is made. By what factor will the density change
q1. suppose a chimpanzee swings through the jungle on vines. if it swings from a tree on a 13 m long vine that starts
a girl is standing at the edge of a cliff 111 m above the ground. she reaches out over the edge of the cliff and throws
A ball player hits a home run, and the baseball just clears a wall 8 m high placed 100.2 m from home plate. The ball is hit at an angle of 38.9o to the horizontal, Determine what is the initial speed of the ball
Brakes cause a frictional force of 2.5 N to the left to stop a 0.975-kg toy car traveling on a level surface at 3.75 m/s to the right. Calculate how far the car will travel while the brakes are being applied before the car finally stops.
A force accelerates a body of mass M. The same force applied to a second body produces three times the acceleration. what's the mass of the second body
A 300 lb bungee jumper wants to jump from the top of a 230 ft high bridge and be able to just touch the water below. what should the bungee cord's relaxed length, l, be for this jump
A spherical blackbody radiator has a temperature of 159°C. Its radius is 0.253 m. what is the net rate of energy radiated from the sphere?
An object, with mass m and speed v relative to an observer, explodes into two pieces, How much kinetic energy is added to the system during the explosion
A fireworks rocket is moving at a speed of v = 44.5 m/s. the rocket suddenly breaks into two pieces of equal mass, What is the magnitude
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