A. Questions for Submission

3.1 Wave and particle properties

1. Identify one piece of evidence that light is a wave.
2. Identify one piece of evidence from the 20th century that light is a particle.

3.2 The photoelectric effect

1. How did Einstein explain the photoelectric effect?

3.3 Philosophy of early quantum mechanics

1. Give one example in which physicists in the early development of quantum mechanics appeared to believe in logically contradictory claims.
2. Does a scientific theory need to be consistent in order to be successful? Explain.

B. For Further Thought (Optional)

The Bohr Atom

1. Use the Bohr model of the atom to explain why a gas associated with a particular element (like neon) glows a particular colour.
2. What role did De Broglie's matter wave hypothesis play in the Bohr model of the atom?