To check that you understand the material covered in this tutorial complete the following quiz. You can find out how you did be pressing the "grade" button at the bottom. You may like to review the tutorial (or read Activity 9 and 10 of VQM Activities) if you are still unsure of this material.
1. What is the electrical charge on a n-type material?
a) negative b) neutral c) positive d) it can vary depending on the materials e) I don't know
2. What is the electrical charge on a p-type material?
3. For the diagram below how much energy must be supplied to cause light to be emitted?
a) 0.25 eV b) 3.25 eV c) 4.00 eV d) 2.25 eV e) Can't tell from this diagram
4. What happens to the electrons in the n-type material when the voltage is increased?
a) they gain energy b) their energy does not change c) they lose energy d) the energy change does not depend on the voltage e) I don't know