Welcome to Seminar Three
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Doing research on Greyland Beach near Westport, Washington(2004)
Agenda
1. Discussion Boards
2. Electromagnetic (EM) Spectrum:
a. microwaves
b. infrared waves
c. visible light waves
3. Unit 4 Discussion Groups
4. Q & A
Discussion Boards (35 points)
1. References transform random opinions into supported points of view.
2. ≥2 substantial replies that further the discussion
No: “I really liked your post…”
“I agree…”
Yes: “I really liked your post and I did some further research and found this additional information…”
“I agree and was able to find this website, but how does that compare …”
Electromagnetic (EM) Spectrum
Image credit: http://www.barnabu.co.uk/cosmic-microwave-background-radiation-in-google-earth/
Cosmic microwave background radiation
These are discussed in Chapter 15 on page 317
Man-made microwaves
Image credit: Microsoft Clip Art
What do you think…
1. Your Grandma Pauline has just won a microwave oven in a radio contest.
- When it arrives at her house, it sits on her counter for a month, unused
- One afternoon, she tells you that she is afraid to use it because ,"If I stand too close, I'll get radiated!”
Explain to your Grandma the difference between the waves that are used in a microwave oven and the dangerous nuclear radiation she fears.
Infrared Waves
Searchwarp.com. (2007, Oct.). Retrieved October 29, 2010, from the World Wide Web: http://searchwarp.com/swa262670.htm
Infrared Waves
Image credit: NASA/JPL-Caltech/IPAC
The primary source of infrared radiation is heat or thermal radiation.
Some animals can “see” in infrared!
Image credit: Sichert, Andreas B., Friedel, Paul and van Hemmen, J. Leo. Snake’s Perspective on Heat: Reconstruction of Input Using an Imperfect Detection System. Physical Review Letters. 97 (2006).
What do you think…
2. Use these spooky infrared pictures of a cat to give some proof to Grandma Pauline that a cat's nose is always cold.
Image credit: SE-IR Corporation, Goleta, CA
What do you think…
• If you took a similar infrared photo of your body, what parts would you expect to show up as brightest orange? What parts would be blue? Explain.
What do you think…
• If you took a similar infrared photo of your body, what parts would you expect to show up as brightest orange? What parts would be blue? Explain.
Image credit: NASA/JPL-Caltech/IPAC
Cold Noses vs. Cold Lips…
Image credit: NASA/JPL-Caltech/IPAC
What do you think…
• After Grandma Pauline starts thinking about electromagnetic waves, she asks you to explain:
- If radio waves and microwaves are both electromagnetic waves, why she can’t listen to KROQ-FM on her new microwave oven?
Visible Light Waves
Visible Light Waves
Image credit: http://scienceblogs.com/startswithabang/2009/12/the_good_and_bad_of_the_new_hu.php
Photosynthesis
Grow ‘Em Plant Propagation. (n.d.). Retrieved October 28, 2010. World Wide Web: http://grow.ars-informatica.ca/gallery.php?img=61
Unit 4 Discussion GroupsBioenergy Geothermal Nuclear
Coal Hydrogen Oil
Solar Hydropower Wind
Fusion Natural Gas
• Suggestion:Thu & Fri: collaborate, strategize, & divide up the workFri – Sun: make separate posts, being careful never to repeatSun & Mon: comment on the suitability of other groups' energy sources
Mon & Tue: vote and explain your vote
Questions?
Image credit: Microsoft Clip Art
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