ESJH Physics - Med 101

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

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