SC300Unit Three

Jamie Gotto

JGotto@kaplan.edu

Agenda

Welcome and Introduction

1. Electromagnetic Waves

a. Infrared/Microwaves

b. Visible light

c. Questions2. Unit 3 overview

3. Q&A

What are electromagnetic waves?• Forms of energy emitted and absorbed by charged particles • Exhibit wave-like behavior as they travel through space

• Electric fields: make electric charges attract or repel each other (protons + and electrons -)

• Magnetic fields: cause magnetic forces

• Changing electric fields cause magnetic fields and vice versa

-This oscillation forms the WAVE

Electromagnetic Spectrum                                                                                                                                          

ID: SC300-03-08-01-R

• Peaks +• Valleys -

• Wavelength- distance between 2 peaks• Frequency- number of peaks per second

• Higher frequency = higher energy = can damage cellshttp://paul-a-heckert.suite101.com/the-electromagnetic-spectrum-a36021

Infrared and Microwaves

• Skim through these sites and report to the class 1 interesting fact you learned. (type in text box)

• http://science.hq.nasa.gov/kids/imagers/ems/micro.html

• http://science.hq.nasa.gov/kids/imagers/ems/infrared.html

Visible Light

• Skim through these sites and report to the class 1 interesting fact you learned. (type in text box)

• http://science.hq.nasa.gov/kids/imagers/ems/visible.html

Questions1. Your Grandma Pauline has just won a microwave oven in a

radio contest. When it arrives at her house, it sits on her counter, unused, for a month. One afternoon, when you visit her, 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.

2. Use this spooky infrared picture of a cat: http://science.hq.nasa.gov/kids/imagers/ems/ircat.gif to give some proof to Grandma Pauline that a cat's nose is always cold.

Questions- Continued

3. 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.

4. After Grandma Pauline starts thinking about electromagnetic waves, she asks you to explain why, if radio waves and microwaves are both electromagnetic waves, you believe she can’t listen to KROQ- FM on her new oven.

Unit 3 Overview

Graded Items

• Discussion

-Science and Revision-Scientific Discoveries

*Remember to use the scientific method in your submissions.

http://graygame205.files.wordpress.com/2011/04/any-questions.jpg