Materials 200B, Winter 2008, Homework 4
Due in class on Tuesday Feb. 5th
Please turn in the two questions in separate answer packages since Alison and
Bharat will grade one each.
QUESTION 1
Here we are going to continue working with our 1D chain of atoms,

Materials 200B, Winter 2010, Homework 8
Due in class on Tuesday March 2nd
Please turn in Question 1 separately from Questions 2 and 3.
QUESTION 1
The band gap of crystalline silicon (Si) at 300K is 1.1 eV, and the electron and
hole effective masses are 1.

Materials 200B, Winter 2010, Homework 4
Due in class on Tuesday Feb. 2nd
Please turn in the two questions in separate answer packages.
QUESTION 1
Here we are going to continue working with our 1D chain of atoms, spaced a
distance a apart, within the LCAO

Materials 200B, Winter 2010, Homework 3
Due in class on Tuesday Jan. 26th
Please turn in Question 1 separately from Questions 2 and 3.
QUESTION 1
(a) In class we showed that the lowest energy orbital in a chain of 1s orbitals spaced
a distance a apart was

Materials 200B, Winter 2010, Homework 9
Due in class on Tuesday March 9th OR THURSDAY MARCH 11TH
IF YOU HOSTED PROSPECTIVE GRADUATE STUDENTS
Usual procedure: please turn in questions 1 and 2 together, and separately from
question 3.
QUESTION 1
Nickel oxid

Materials 200B, Winter 2010, Homework 1
Due in class on Tuesday Jan. 12th
Please turn in Question 1 in one package, and Questions 2 and 3 in another to
help Casey and Andrew split the grading.
QUESTION 1
Aluminum crystallizes in the face-centered-cubic (F

2a. Several reasons why III-nitrides make good light-emitting devices at short
wavelengths:
- Direct bandgap
- Wide bandgap
- p-type and n-type doping available/possible
- Readily-available elements
- Very hardy material (high temperature, tough, etc)
2b.

Materials 200B, Winter 2010, Homework 2
Due in class on Tuesday Jan. 19th
Please turn in Questions 1 separately from Questions 2/3.
QUESTION 1
(a) How do we go about calculating the quantum mechanical probability that an
electron will be at a specific poi

HW2Q1
HWQ3
A)
For hydrogen iodide:
HI =
mH mI
;
mH + mI
m H = 1.008 amu,
m I = 126.9 amu
HI 1.0amu = 1.66 10 27 kg
El =0 = 0
El =1 =
2 2
1(1 + 1)(1.054 10 34 J .s ) 2
22 J s
=
4
.
15
10
2(1.66 10 27 kg )(1.27 10 10 m) 2
kg.m 2
.
10 =
1240eV .nm
= 4.79

Interactions in soft matter
The forces of nature:
1.
2.
3.
4.
Strong forces hold protons and neutrons together (exchange of mesons)
Weak interactions are involved in some kinds of radioactive decay (-decay)
Coulombic or electrostatic forces hold most matt

Materials 200B, Winter 2010, Homework Week 6
Due in class on Tuesday Feb. 16th
Please turn in question 1 in one answer package, and questions 2 and 3 3 in a
separate answer package.
QUESTION 1
Here well continue to discuss simple cubic polonium, Po, which

Materials 200B, Winter 2010, Homework 7
Due in class on Tuesday Feb. 23rd
QUESTION 1
An intrinsic semiconductor with a band gap energy, Eg = 1 eV has equal hole
and electron effective masses, mp = mn = me , where me is the free electron effective
mass.
(a

Materials 200B, Winter 2008, Homework 2
Due in class on Tuesday Jan. 22nd
Please turn in the two questions in separate answer packages since Alison and
Bharat will grade one each.
QUESTION 1
This problem follows the results of the following two articles:

Materials 200B, Winter 2008, Homework 7
Due in class on Tuesday Feb. 26th
Usual procedure: please turn in questions 1 and 2 separately.
QUESTION 1
Yes, this one looks really like the one you did last week, but this time its for an
extrinsic semiconductor!

MAT 200B 2010 Discussion Week 5
This is the mid-term exam. from last year
MAT 200B Mid-Term exam
Thursday Feb. 5th 2009, 2 - 3.45 pm
Rules
1. One 8.5x11 page with notes on one side allowed.
2. I will not answer any questions during the exam. If you are st

Materials 200B, Winter 2008, Homework 3
Due in class on Tuesday Jan. 29th
Please turn in the two questions in separate answer packages since Alison and
Bharat will grade one each.
QUESTION 1
This question reviews some of what weve covered throughout the q

Materials 200B, Winter 2008, Homework 6
Due in class on Tuesday Feb. 19th
(In case youre wondering about where Homework 5 went, that was the additional
mid-term question).
Please turn in questions 1 and 2 in one answer package, and question 3 in a
separat

Materials 200B, Winter 2008, Homework 9
Due in class on Thursday March 13th
Usual procedure: please turn in questions 1 and 2 separately.
QUESTION 1
(a) What are the values of the n, l and m quantum numbers for an electron in a 1s
orbital in the hydrogen