This self-assessment page completes the Electronic Materials module, and covers material from the following sessions.

- Session 13: Band Theory of Solids
- Session 14: Semiconductors
- Session 15: Introduction to Crystallography (first part)

On this page are a simple **weekly quiz and solutions**; relevant **exam problems and solutions** from the 2009 class; **help session videos** that review selected solutions to the exam problems; and **supplemental exam problems and solutions** for further study.

### Weekly Quiz and Solutions

This short quiz is given approximately once for every three lecture sessions. You should work through the quiz problems in preparation for the exam problems.

### Exam Problems and Solutions

These exam problems are intended for you to demonstrate your personal mastery of the material, and should be done alone, closed-book, with just a calculator, the two permitted reference tables (periodic table, physical constants), and one 8 1/2" x 11" aid sheet of your own creation.

After you’ve taken the exam, watch the help session videos below for insights into how to approach some of the exam problems.

### Exam Help Session Videos

In these video, a 3.091 teaching assistant reviews one of the exam problems, demonstrating their approach to the solution, and noting some common mistakes made by students.

### Supplemental Exam Problems and Solutions

These additional exam problems from prior years’ classes are offered for further study.