1. ROYGBIV FORMAT
NUMBER LINE FORMAT

2. June 5 / Act F 96
The Electromagnetic Spectrum
LEARNING TARGET: I can identify and describe the parts of the electromagnetic spectrum
CH Q
What are the characteristics of electromagnetic waves?
VOCAB:
Electromagnetic spectrum infrared
Electromagnetic wave ultraviolet

3. Electromagnetic Spectrum (EM Spectrum)
VOCAB:
Electromagnetic Spectrum (EM Spectrum)
electromagnetic wave
infrared
ultraviolet
continuous range of wave energy from very long radio waves to very short gamma rays
transmits energy across distance using electric and magnetic fields
"below red" – long low energy waves associated with heat (but does NOT require a medium)
"above violet" – short high energy waves associated with skin cancer and cataracts

4. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. F 37-41
DATA: WS The Electromagnetic Spectrum WS Drawing the E-M Spectrum

5. for FRONT of WS 96.2 copy below
R O Y G B V
Tour of EM video – 5 mins

6. amount reaching Earth surface
BACK of WS 96.2 copy below
type of wave
transverse - Electromagnetic Wave (SPECTRUM)
amount of heat
more than VL red
red greatest heat of VL
action of wave
can be absorbed, reflected or transmitted
amount of energy
least
greatest
radar
heat food
cell phones
heat up objects remote controls
human vision
sterilize objects
treat cancer
uses
radio / TV
view body
skin cancer cataracts
danger
genetic mutations
amount reaching Earth surface
most UV absorbed by atmosphere
(all xray and gamma)
greatest amount produced by the Sun
see next slide

7. all have wavelength, peak/crest, trough, and amplitude
up to 1000s
103
10-2
10-5
10-7
10-8
10-10
10-12
all have wavelength, peak/crest, trough, and amplitude
parts of wave

8. POST DISCUSSION
What would the result of the experiment have been if Herschel had not used a control?
no discovery of invisible infrared energy. And Ritter would not have built on that and discovered ultraviolet energy)
Herschel video – 3 mins
Ritter video – 1 min

9. Venn Diagram comparing Infrared and Ultraviolet
Lower frequency
Longer wavelength
Less energy
Not Visible
Stimulates molecules in skin to produce heat
Generally not damaging to skin & eyes
Uses – remote controls, night vision, glasses
Higher frequency
Shorter wavelength
More Energy
Visible to the eye
Does Not heat up skin
Damages skin & eyes
Uses – telescopes, sanitizing medical equipment
Electromagnetic energy
Lots given off by the sun
Reflect, Refract & Absorb
E-M Wave Comparison

10. - Discuss and answer Q 1&2 on pg. F 41
ANALYSIS
- Discuss and answer Q 1&2 on pg. F 41
ANS CH Q
What are the characteristics of electromagnetic waves? A:
they have a very wide range of wavelength (energy) - only a very small part can be seen by humans – all can be transmitted, absorbed or reflected by a medium, but do NOT need a medium
HOMEWORK
None