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
Wednesday, March 29, 2006
http://camillasenior.homestead.com/optics.html - Link for the first part of the webquest
Websites for second part of quest
Laser Eye Surgery: Is it worth looking into?
Visit this site to read an article from the FDA Consumer Magazine about laser eye surgery to correct vision problems. The site includes a description of how vision works, and a description of both laser-assisted in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) surgeries. Scroll down to learn who is a candidate for laser eye surgery and for answers to frequently asked questions about these procedures. This is an excellent, comprehensive, and unbiased site.
- Comprehensive Info on LASIK and Other Vision Surgery Techniques.
At this site you can learn all about the various types of surgery available to correct vision problems. Scroll down and click on types of corrective surgery to read about flap procedures such as LASIK, LASEK, and ALK; photoablation procedures such as PRK; and corneal incision procedures such as RK, HK, and AK. Each procedure is covered in detail at this site.
- The LASIK Procedure.
Go to this site for a basic description of the LASIK eye surgery. Scroll down and click on detailed description to see photos of this procedure.
- Laser Eye Surgery, PRK, LASIK: The Inventions of Sight.
Visit this site to read about the history of the development of vision correction devices. Then read about the newest ways to treat vision problems by clicking on is PRK for me.
- National Eye Institute.
At this site you can find information on eye diseases, and eye care resources. Although it doesn’t discuss laser eye surgery directly, it does have diagrams and information on vision and vision problems.
- LASIK Institute.
Visit this site to find out more about laser eye surgery, particularly LASIK surgery. This site provides patients with detailed information on laser eye surgery. It also provides information for surgeons and researchers.
- LASIK Eye Surgery: What is LASIK?
Go to this Food and Drug Administration (FDA) site for information on the eye and vision errors and to learn about the types of surgery to correct those errors. In the menu bar at the top of the page, click on when is LASIK not for me to find out who is not a candidate for this type of surgery.
- Introduction to Refractive Errors.
At this site by the Cornea and Laser Eye Institute you can find out what causes vision errors and how laser surgery can correct these errors.
- Laser eye surgery: experts prescribe caution.
Visit this CNN.com site to read about some of the problems associated with laser eye surgery.
Monday, March 27, 2006
Tuesday, March 07, 2006
Waves!
An Internet WebQuest on Light and Sound
Introduction
We are surrounded by waves. Some we are very aware of - waves on the surface of a lake, the wave that takes place in the stadium of an athletic event. Others we are less aware of, though often we notice their effects - sound and light waves for example.
The Quest
Select a type of wave, conduct research, and prepare a computer presentation.
The Process and Resources
In this WebQuest you will explore Web pages about wave characteristics, light and sound
Begin by getting some background.
Phase 1 - Background: Something for Everyone
Use the Internet information linked below to define and understand wave characteristics, light and sound. You may also use your physical science textbook, your library's catalog and/or magazine articles.
- Encyclopedia.Com, Powered by eLibrary - Search for general information on wave characteristics, light and sound.
Phase 2 - Instructions in depth
1. Research general information on wave characteristics, light and sound using the internet links provided.
2. Create a list of different types of waves.
3. Choose one of the waves generated by the list above. Once you have made your decision, notify Mr. Gibney.
4. Conduct more specific research on the wave you chose. Use the Internet links provided, magazines online, inter-library loan, the school library, etc.
Use the Internet information linked below to research and solve the problems:
General Information
- Acoustics : An Unofficial Introduction
- Characteristics of a Pressure Wave
- Characteristics of Light and Sound Waves
- Electromagnetic Waves
- Incredible Sound Wave
- Light and Optics
- Sound Site
Lessons
- How Do We Know Light Is a Wave?
- Light and Sound Unit
- The Nature of a Sound Wave
- Wave Characteristics
- Waves, Light and Sound Review
Experiments
Technical Information
Phase 3 - Researching, Creating and Cooperating
· Create your computer presentation using PowerPoint
Save the presentation in the appropriate Physics Folder
· Include graphics where appropriate.
· The first slide should include the title and your name.
· The last slide should be the bibliography (this includes where you found your graphics).
Phase 4 - Waves : Characteristics, Light and Sound Rubric
| | Awesome | Admirable | Acceptable | Unacceptable |
| Organization | -Well organized -Logical format -Transitions from idea to idea were excellent, enhancing the project | -Thoughtfully organized -Easy to follow most of the time -Transitions easy to follow, but at times ideas unclear | -Somewhat organized -Somewhat incoherent -Transitions not always smooth and at times distracted the audience | -Choppy and confusing -Difficult to follow -Transitions were abrupt and distracted audience |
| Cooperation | -Worked extremely well with others -Solicited, respected and complemented each other's ideas -Highly productive | -Worked very well with others -Worked to get everyone involved -Productive team | -Attempted to work well with others -At times "off task" and not everyone was actively involved | -Was dysfunctional -Did not respect each other's opinions -Argued often -Little or no teamwork |
| Project Contents | -Excellent job of research -Utilized information effectively | -Good job of research -Utilized information in an efficient manner | -Acceptable job of research -Limited information | -Unacceptable job of research -Little or no fact gathering |
| Project Presentations | -Original, unique approach -Engaging, provocative | -Clever, at times unique -Well done, interesting | -Few original touches -At times interesting | -Predictable, bland -Did not keep audience interested |
| Conceptual Understandings | -Demonstrates in-depth understanding of wave characteristics, light and sound | -Demonstrates understanding of wave characteristics, light and sound | -Demonstrates fairly complete understanding of wave characteristics, light and sound | -Demonstrates unclear understanding of wave characteristics, light and sound |
Conclusion
You have all done a lot of research on wave characteristics, light and sound. You know a lot! Nice work. You should be proud of yourselves! How can you use what you've learned in your everyday life? What real life applications do you see as a result of this activity? What other information about wave characteristics, light and sound could still be explored? Remember, learning--like waves--never stops working.
Sunday, March 05, 2006
