Thursday, March 30, 2006
Light Study Guide
Answer Section
MULTIPLE CHOICE
1. B
2. C
3. D
4. C
5. A
6. B
7. B
8. D
9. D
10. C
11. A
12. D
13. C
14. B
15. B
SHORT ANSWER
16. diffuse
17. specular
18. opaque—does not allow any light through, brick wall; translucent—light can pass through but light is scattered, cannot see through, waxed paper
19. No; it could be a filter.
20. less heat, therefore less air conditioning; less electricity, save fuel, less pollution, lower operating cost
21. The angle at which light strikes a surface is the same as the angle at which it is reflected.
22. Light slows down as it enters glass; as the wave is slowed, the light bends.
23. Most reflected light that is seen as a glare is reflected horizontally. Polarizing filters block this light cutting down on glare.
24. electricity flows through a low-pressure gas; atoms of the gas receive energy from the electricity; these atoms give off energy in the form of UV radiation; phosphors, substances on the inside of the tube, absorb the UV radiation and give off light
25. CD players, surgical tools, cutting, welding, surveying, measurement, telephone systems, holography
26. A hologram is made with a laser and is 3-D.
27. transparent: transmits almost all light; example: glass window; translucent: allows some light through; example: frosted glass
