We also counted teacher stamps today.
Semester 2 Test 2 Review
The test is on Wednesday, February 18, 2009.
In addition to the questions below, you need to be able to list the entire electromagnetic spectrum in order and to tell me who can see whom in a mirror.
p.419-420
8. How do the frequencies of infrared, visible, and ultraviolet light compare?
18. Distinguish between an umbra and a penumbra.
20. What is the difference between light that is polarized and light that is not?
24. What evidence can you cite to support the idea that light can travel through a vacuum?
p. 439
2. Are black and white real colors, in the sense that red and green are? Explain.
p. 460-462
4. What is meant by the normal to a surface?
5. What is the law of reflection?
6. When you view your image in a plane mirror, how far behind the mirror is your image compared with your distance from the mirror?
12. Distinguish between reflection and refraction.
13. When a wave crosses a surface at an angle from one medium into another, why does it “pivot” as it moves across the medium into the new medium?
28. Suppose that a mirror and three lettered cards are set up as in the figure. If a person’s eye is at point P, which of the lettered cards will be seen reflected in the mirror? Explain.
30. Trucks often have signs on their backs that say, “If you can’t see my mirrors, I can’t see you.” Explain the physics here.
35. If you were spearing a fish with a spear, would you aim above, below, or directly at the observed fish to make a direct hit? Would your answer be the same if you used laser light to “spear” the fish? Defend your answers.
39. Suppose you walk toward a mirror at 1 m/s. How fast do you and your image approach each other? (The answer is not 1 m/s.)
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