Unit 4 Review: Quantum Physics

Monday and Tuesday this week we are doing review problems for the unit 4 test, which will be on Wednesday, October 28 for periods 1, 3, and 5 and on Thursday, October 28 for periods 2 and 6. Periods 1, 3, and 5 will be 90 minutes long (see here), so when we're done with the test we'll go outside and hang in the sun (if there is sun) or play the Five Letter Word Game. If that doesn't appeal to you, bring something to do.

Here are the review questions (numbers taken from the blue Hewitt book):
2. What is a quantum? Give two examples.
3. What is a quantum of light called?
4. What is Planck's Constant, and how does it relate to the frequency and energy of a photon?
5. Which has more energy per photon - red light or blue light? Why?
6. What is the photoelectric effect?
11. As the speed of a particle increases, does its associated wavelength increase or decrease?
13. How does the energy of a photon compare with the difference in energy levels of the atom from which it is emitted?
20. Can the speeds and positions of electrons in an atom be measured with certainty?
21. What does it mean to say that a certain quantity is quantized?
23. A very bright source of red light has much more total energy than a dim source of blue light, but the red light does not eject electrons from a certain photosensitive surface. Why is this so?
24. Which photon has the most energy - one from infrared, visible, or ultraviolet light?
25. If a beam of red light and a beam of green light have exactly the same total amount of energy, which beam has the greater number of photons? Explain.
28. We do not notice the wavelength of moving matter in our ordinary experience. Is this because the wavelength is extraordinarily large or extraordinarily small?
A. What was Rutherford's gold experiment and why was it important?
B. Find the energy of a photon with frequency f=3x10^14 Hz.
C. Find the frequency of a photon with energy E=9 units.