1. 11.2, text.

2. 11.7, text.

3. 11.8, text

4. In 11.8, which material makes a more efficient solar cell?

5. Explain what is happening in question 4, considering your answer to question 3.

6. 11.9, text.

7. 11.12, text.

8. 11.15 (this is sort of a trick question - a. and b. have the same answer!)