The wavelength of the light emitted by Aluminium phosphide diode has to be calculated. Concept introduction: According to Band theory of solids, the energy levels of a substance are imagined as “bands”. There are two types of bands – valence band and conduction band. Low lying bands are valence band and conduction band where the conduction takes place, lies above the valence band. The energy gap between the valence band and conduction band is called “band gap”. The energy gap can be represented by Planck’s equation, E = hν where ν = c λ E = energy h = Planck's constant ν = frequency c = velocity of light λ = wavelength
The wavelength of the light emitted by Aluminium phosphide diode has to be calculated. Concept introduction: According to Band theory of solids, the energy levels of a substance are imagined as “bands”. There are two types of bands – valence band and conduction band. Low lying bands are valence band and conduction band where the conduction takes place, lies above the valence band. The energy gap between the valence band and conduction band is called “band gap”. The energy gap can be represented by Planck’s equation, E = hν where ν = c λ E = energy h = Planck's constant ν = frequency c = velocity of light λ = wavelength
Solution Summary: The author explains that the wavelength of the light emitted by Aluminium phosphide diode has to be calculated. The energy gap between the valence band and conduction band is represented by Planck’s equation
The wavelength of the light emitted by Aluminium phosphide diode has to be calculated.
Concept introduction:
According to Band theory of solids, the energy levels of a substance are imagined as “bands”. There are two types of bands – valence band and conduction band. Low lying bands are valence band and conduction band where the conduction takes place, lies above the valence band. The energy gap between the valence band and conduction band is called “band gap”. The energy gap can be represented by Planck’s equation,
5) Oxaloacetic Acid is an important intermediate in the biosynthesis of citric acid. Synthesize oxaloacetic acid
using a mixed Claisen Condensation reaction with two different esters and a sodium ethoxide base. Give your
answer as a scheme
Hint 1: Your final acid product is producing using a decarboxylation reaction.
Hint 2: Look up the structure of oxalic acid.
HO
all
OH
oxaloacetic acid
20. The Brusselator. This hypothetical system was first proposed by a group work-
ing in Brussels [see Prigogine and Lefever (1968)] in connection with spatially
nonuniform chemical patterns. Because certain steps involve trimolecular reac
tions, it is not a model of any real chemical system but rather a prototype that
has been studied extensively. The reaction steps are
A-X.
B+X-Y+D.
2X+ Y-3X,
X-E.
305
It is assumed that concentrations of A, B, D, and E are kept artificially con
stant so that only X and Y vary with time.
(a) Show that if all rate constants are chosen appropriately, the equations de
scribing a Brusselator are:
dt
A-(B+ 1)x + x²y,
dy
=Bx-x²y.
di
Problem 3. Provide a mechanism for the following transformation:
H₂SO A
Me.
Me
Me
Me
Me
Chapter 10 Solutions
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