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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 1kg block is attached to a horizontal spring where k = 200N/m. The block is extended 5cm (.05m) from equilibrium andreleased at time = 0. What is the displacement as a function of time?
If 50.0cm of copper wire (diameter = 1.0mm) is formed into a circular loop, at what rate is thermal energy generated in the loop
The radius of a uniform solid sphere is measured to be (6.15 ± 0.15) cm, and its mass is measured to be ( 1.80 ± 0.04 ) kg. Determine the density of the sphere
Light from a helium-neon laser (?=633nm) is used to illuminate two narrow slits. What is the spacing (in mm) between the slits
describe the pattern observed from diffraction around a straight edge for the straight edgeopaque disks. why do you
an empty hollow metal sphere has a potential of 160 v with respect to ground defined to be at v 0 and has a charge of
suppose the insulating qualities of the wall of a house come mainly from a 4.0 inch layer of brick and an r-19 layer of
Violet light has a wavelength of about 410 nm. What is its frequency? Calculate the energy of one photon of violet light. What is the energy of 1.0 mol of violet light photons? Compare the energy of photons of violet light with those of red light...
The small piston of a hydraulic lift has a cross-sectional area of 3.30 cm2, and its large piston has a cross-sectional area of 197 cm2. What downward force of magnitude F1 must be applied to the small piston for the lift to raise a load whose weight..
You are working in a research group investigating more energy efficient city busses. One option is to store energy in the rotation of a flywheel when the bus stops and then use it to accelerate the bus. The flywheel under consideration is a light-..
Two tiny conducting spheres are identical and carry charges of -18.5C and +51.6C. They are separated by a distance of 1.92 cm. (a) What is the magnitude of the force that each sphere experiences?
The top of the spring is connected to a string of mass per unit length of 2:0 10??3 held under a tension of 80 N. What is the velocity of the pulse
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