Objectives

1
AIM What is the Electromagnetic Spectrum?
Objectives
Identify the parts of the electromagnetic
spectrum Demonstrate the relationship between
wavelength and frequency in the EM spectrum
2
AIM What is the Electromagnetic Spectrum?
Vocabulary
electromagnetic spectrum, radio waves, infrared
rays, visible light, ultraviolet rays, x rays,
gamma rays Roy G. Biv
3
AIM What is the Electromagnetic Spectrum?
Concepts
Light is an electromagnetic wave But we can see
light. Most E/M waves can not be seen!
4
AIM What is the Electromagnetic Spectrum?
Concepts
Pure visible white light is actually made up of
various colors of the spectrum. This rainbow of
colors is clearly visible when looking at light
through a prism
5
AIM What is the Electromagnetic Spectrum?
Demo
Examine light through a prism or a
spectrometer! What do you see?
6
Roy g biv
7
When you look at light through a prism you may
see something which looks like this!
8
AIM What is the Electromagnetic Spetrum?
Pattern
Light through a prism is diffracted according to
its frequency and wavelength Red has a longer
wavelength speed Frequency x wavelength
9
Pattern
Red has a longer wavelength speed Frequency x
wavelength Since the speed of light is
constant What can you conclude about its
frequency It must be smaller
10
Pattern
Blue has a shorter wavelength speed Frequency x
wavelength Since the speed of light is
constant What can you conclude about its
frequency Shorter wavelength greater
frequency!
11
Long W/L
Short W/L
Colors of the Spectrum
12
(No Transcript)
13
Radio Waves Have a long W/L. What type of
frequencies would they have?
14
Microwaves What are microwaves?
15
Infrared You can not see infrared waves. You can
feel them as heat
16
Visible Light ROY G. BIV
17
Ultraviolet Ray Can not be seen. In sunlight.
Causes sunburn. Also used to kill bacteria
18
X Ray Can not be seen. Have a short W/L. What
type of frequency do they have? What are they
used for?
19
Gamma Ray Have a very short W/L. What type of
frequency do they have? Used in nuclear physics
20
Shorter wavelength Higher Frequency
longer wavelength lower Frequency
21
Shorter wavelength Higher Frequency
longer wavelength lower Frequency
22
(No Transcript)
23
AIM What is the Electromagnetic Spectrum?

• Class Activity
• W/S Concepts 9-9

24
AIM What is the Electromagnetic Spectrum?

• Homework
• INTERNET QUESTIONS