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SC300 Big Ideas in Science Unit 3: Electromagnetic Waves Bronwyn Scott [email protected] AIM: [email protected]
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Welcome to Seminar Three
• Please turn your speakers on. This seminar contains audio.• While we are waiting to get started this evening, please take
this opportunity to chat.• If you encounter any technical issues accessing a KHE
Seminar, please call KU ACE Help 1-866-522-7747, option 2, then option 1. You may also email KU ACE Help at [email protected].
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
