Question

2. What are R-G centers and what is the R-G current?

Answer #1

R-G center recombination involves a two step process. A carrier and electron, for example, strays into the vicinity of an R-G center, an electronic level near mid-gap, and is trapped. Later comes a hole and the electron is attracted to the hole and loses more energy so it goes into the valence band annihilating the hole along with itself, this is called indirect recombination. This method releases thermal energy or produces lattice vibrations.

R-G centers are special locations within the semiconductor which are lattice defects or special impurity atoms that introduce allowed electronic levels near the center of the band gap.

If G is an n-vertex r-regular graph, then show that n/(1+r)≤
α(G) ≤n/2.

The centers of a 10 kg lead ball and a 100 g lead ball are
separated by 9 cm.
(a) What gravitational force does each exert on the other?
___N
(b) What is the ratio of this gravitational force to the weight of
the 100 g ball?
F / W100 g = ____

Let f: R -> R and g: R -> R be differentiable, with g(x) ≠
0 for all x. Assume that g(x) f'(x) = f(x) g'(x) for all x. Show
that there is a real number c such that f(x) = cg(x) for all x.
(Hint: Look at f/g.)
Let g: [0, ∞) -> R, with g(x) = x2 for all x ≥ 0. Let L be
the line tangent to the graph of g that passes through the point...

Draw the structure of cholesterol
and 5a,6a-epoxychloestan-3b-ol in pen.
Star the chiral centers. Indicate R/S for all
stereogenic centers. How many steriosomers could there
theoretically be for each compound?

function [Ax,Ay,Az]=GravityAcc(M1,X1,Y1,Z1,X2,Y2,Z2)
%We are calculating the acceleration for object 2
G=6.67408*1e-11;
R=?
Am=G*M1/(R^2);
Ax=(X1-X2)/R*Am;
Ay=(Y1-Y2)/R*Am;
Az=(Z1-Z2)/R*Am;
end
What is R in this gravitational acceleration code?

Find an arc length parametrization of r(t)=<3t^2,
2t^3>.
r(g(s))=<_______________, +-____________________>

A wire of radius R carries a non-uniform current described by
the current density J = A r^3 where r is the radial distance from
the center of the wire
1 write an expression for the total current that flows through
the wire in terms of the parameters A, R, and constants.
2) What is the magnetic field B in the region r < R. Be sure
to specify the direction of the field.
3) A positive charge is moving...

2) What are the sources of economic growth in urban centers?
What determines the economic growth and size of a city? Take New
York City as an example of almost unbroken triumph for economic
growth and development. What explains New York’s steady
success?

Suppose g: P → Q and f: Q → R where P = {1, 2, 3, 4},
Q = {a, b, c}, R = {2, 7, 10}, and f and g are defined by
f = {(a, 10), (b, 7), (c, 2)} and g = {(1, b), (2, a), (3, a), (4,
b)}.
(a) Is Function f and g invertible? If yes find f −1
and g −1 or if not why?
(b) Find f o g and g o...

Let R*= R\ {0} be the set of nonzero real
numbers. Let
G= {2x2 matrix: row 1(a b) row 2 (0 a) | a in
R*, b in R}
(a) Prove that G is a subgroup of GL(2,R)
(b) Prove that G is Abelian

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