Solid-state physics, Band gap
a, How does the size of the band gap depend on the strength of
the periodic potential?
b, Which type of material would you expect to have the stronger
periodic potential, a metal or an insulator? Why?
Please explain thoroughly
Show that electrons in states near the conduction band minimum
behave as free electrons with an 'effective mass' m. (Hint: Expand
the dispersion relation E(k) locally into a Taylor series)
TeF5- anion.
a) How many valence electrons does Te have?
b) How many valence electrons does F have?
c) Write the Lewis structure of TeF5 - anion:
d) Assign formal charges to each atom in the Lewis structure of
the TeF5 - anion.
e) What is the hybridization of the orbitals on the central atom
in the anion TeF5 -?
d) Predict the molecular geometry of the TeF5 - anion:
Modern Physics: Solid State and Nuclear
Physics
You want to use the Hall Effect to determine if a particular
sample of a semiconductor is n or p doped.
a. Sketch the following configuration: the sample is placed flat
on the page. The applied voltage source is attached such that the
positive lead is nearest to the top of the page, and the negative
near the bottom. The magnetic field goes into the page. Identify on
your drawing the direction of...
Derive the density of states of electrons in a three dimensional
solid. Using this density of
states show that the specific heat of electrons (which is a
fermion) in a three dimensional
solid is linear in temperature T.
Part A
In the ground-state electron configuration of Fe3+, how many unpaired electrons are present? Express your answer numerically as an integer.
Part B
Build the orbital diagram for the ion most likely formed by phosphorous. Use the buttons at the top of the tool to add orbital's in order of increasing energy, starting at the bottom with the lowest energy orbitals. Click within an orbital to add electrons.
For a bromine (Br) atom in its ground electronic state:
How many electrons are there in the 4s
orbital? (Enter an integer.)
How many electrons are there in the 3d
orbitals? (Enter an integer.)
How many electrons are there in the 4p
orbitals? (Enter an integer.)
How many unpaired electrons are there? (Enter
an integer.)
To what block does this atom belong? (Enter s,
p, d, or f.)
(Solid state and atom physics)
The structure of a carbon crystal and a silicon crystal are the
same. Why is the carbon crystal transparent and the silicon crystal
is not?