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SC300 Big Ideas in Science. Bronwyn Scott BScott@kaplan.edu AIM: BScottKaplan@aol.com. Unit 3: Electromagnetic Waves. Welcome to Seminar Three. Doing research on Greyland Beach near Westport, Washington(2004). Please turn your speakers on. This seminar contains audio.

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sc300 big ideas in science

SC300 Big Ideas in Science

Bronwyn Scott

BScott@kaplan.edu

AIM: BScottKaplan@aol.com

Unit 3: Electromagnetic Waves

welcome to seminar three
Welcome to Seminar Three

Doing research on Greyland Beach near Westport, Washington(2004)

  • 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 helpdesk@kucourses.com.
agenda
Agenda
  • Discussion Boards
  • Electromagnetic (EM) Spectrum:
    • microwaves
    • infrared waves
    • visible light waves
  • Unit 4 Discussion Groups
  • Q & A
discussion boards 35 points
Discussion Boards (35 points)
  • References transform random opinions into supported points of view.
  • ≥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 …”

cosmic microwave background radiation
Cosmic microwave background radiation

Microwaves are everywhere!

These are discussed in Chapter 15 on page 317

Image credit: http://www.barnabu.co.uk/cosmic-microwave-background-radiation-in-google-earth/

man made microwaves
Man-made microwaves

Image credit: Microsoft Clip Art

what do you think
What do you think…
  • 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
Infrared Waves

Searchwarp.com. (2007, Oct.). Retrieved October 29, 2010, from the World Wide Web: http://searchwarp.com/swa262670.htm

infrared waves1
Infrared Waves

The primary source of infrared radiation is heat or thermal radiation.

Image credit: NASA/JPL-Caltech/IPAC

some animals can see in infrared
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 think1
What do you think…
  • 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 think2
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 think3
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
Cold Noses vs. Cold Lips…

Image credit: NASA/JPL-Caltech/IPAC

what do you think4
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 waves1
Visible Light Waves

Image credit: http://scienceblogs.com/startswithabang/2009/12/the_good_and_bad_of_the_new_hu.php

photosynthesis
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 groups
Unit 4 Discussion Groups

Bioenergy Geothermal Nuclear

Coal Hydrogen Oil

Solar Hydropower Wind

Fusion Natural Gas

  • Suggestion:
    • Thu & Fri: collaborate, strategize, & divide up the work
    • Fri – Sun: make separate posts, being careful never to repeat
    • Sun & Mon: comment on the suitability of other groups' energy sources
    • Mon & Tue: vote and explain your vote
questions
Questions?

Image credit: Microsoft Clip Art