LESSON 3 - The Electromagnetic Spectrum
- Be introduced to the Electromagnetic Spectrum.
- Realize that there is energy beyond visible light that we cannot
- Identify examples of parts of the EM Spectrum in the Wavestown picture.
Wavestown picture (262k) pdf
document (1 per student)
Wavestown picture - answer key
description worksheet (1 per student)
IMAGERS - Electromagnetic
Spectrum Web Site
Digital satellite image Worksheet (18k)
Digital satellite image Answer key (31k)
Ask students "what is light?" White light is all colors,
like the colors of the rainbow. Explain that Isaac Newton discovered
the color of light by shining white light through a prism. Demonstrate
his experiment using a flashlight and a prism. Tell students that
this is called the "visible light spectrum." The visible light spectrum
is a part of a larger spectrum called the electromagnetic spectrum.
Explain that light is energy and that there is energy beyond visible
light. In this lesson, they will be studying the electromagnetic spectrum.
Take students to computer lab. Begin on the IMAGERS
- Student's Site and select the Electromagnetic
Spectrum. Read the first page titled "What are waves?"
together. Then, give each student the Wavestown picture. Have students
use the electromagnetic spectrum site to help them label examples
of the electromagnetic spectrum found in Wavestown. Students should
read the description on the site then look for examples in Wavestown.
(If access to computer lab is unavailable, use the worksheet provided.)
When students complete this exercise, discuss their answers
as a class. Begin with radio waves. Ask students to give examples
found in Wavestown. Continue with microwaves and the other wavelengths
to gamma rays.
Continue the lesson by giving students the digital
satellite image worksheet. Explain that satellites have sensors
which can detect infrared energy, a part of the electromagnetic spectrum.
Data gathered by these sensors can be used to make images. Images
are created using Red, Green and Blue light, similar to the Digital
Picture worksheet used in lesson 2. Review the color combinations
with them. Have them label the key with the correct color, then complete
the picture. Students may complete it for classwork or homework. Review
the results in the next lesson. This worksheet reinforces content
on remote sensing introduced in the adventure and introduces concepts
in Remote Sensing Lesson 4 and 5.
Use the Wavestown picture to assess students understanding
of the different energies in the electromagnetic spectrum.
Tips for Teachers
- IMAGERS - Electromagnetic Spectrum
Web Site - Preview the electromagnetic spectrum web site the day
before teaching this lesson. Find objects to represent different electromagnetic
energy, i.e. pocket radio, microwave popcorn, remote control, etc.
- Wavestown activity - You may want to review the answers to this
activity prior to the lesson because some answers may surprise you.
RETURN TO TEACHER'S