1. The Spectacular Spectrum
Understanding the Electromagnetic Spectrum
http://www.youtube.com/watch?v=cfXzwh3KadE

2. Key Objectives:
 The student will:
– investigate and understand
the nature and applications of
electromagnetic waves

3. Key Objectives:
 The student will:
– Compare various types of
waves in the electromagnetic
spectrum in terms of
wavelength, frequency and
energy

4. Key Objectives:
 The student will :
– Describe everyday
applications of each of the
major forms of
electromagnetic radiation

5. Key Objectives:
 The student will :
– Recognize that
electromagnetic waves are a
form of radiant energy not
requiring a medium to travel

6. Key Terms
 Electromagnetic
Spectrum
 Electromagnetic
Waves
 Microwaves
 Infrared Waves
 Visible light
 Ultraviolet Light
 X-Rays
 Gamma Rays

7. Electromagnetic Waves
 http://www.youtube.com/watch?v=xZ6XU
k7QLbU

8. Electromagnetic Spectrum
 This electromagnetic spectrum
(EMS) is the radiant energy
released from the sun.

9. Electromagnetic Spectrum
 It travels at the speed of light
through space and includes all
types of electromagnetic waves

10. Electromagnetic Spectrum

11. Electromagnetic Spectrum
 There are seven types of
electromagnetic waves in the
EMS
 Radio Waves
 Microwaves
 Infrared Waves
 Visible Light Waves
 Ultraviolet Waves
 X-Rays
 Gamma Rays

12. Radio Waves

13. Radio Waves
 The electromagnetic
waves with the
lowest frequency.
 Used to transmit
radio and television
signals (Before
Digital TV)
 The largest band
making 20 % of the
EMS

14. Microwaves

15. Microwaves
 The second
frequency level of the
EMS.
 Used to send cell
phone signals and to
cook food
 Make up 15% of the
EMS

16. Infrared waves

17. Infrared waves
 The level just beneath
visible light.
 It measures heat as it
reflects off objects.
 Night vision goggles
use it to see objects in
total darkness.
 Make up 13% of the
EMS

18. Visible light
 The smallest
section about
9% of the EMS.
 It allows us to
see.
 ROYGBIV

19. The Visible Light Spectrum
(Wavelengths)

20. Ultraviolet Light
 Means above violet light on the
visible light spectrum so it
cannot be seen.
 Makes up 12% of the
EMS
 If unprotected it
may cause:
– sunburn
– skin cancer

21. X-Rays
 Make up 16% of the
total EMS
 X-Rays can pass
through many
substances.
 Lead is one of a few
substances that prevent
the transfer of X-Rays

22. X-Ray of Hands

23. Gamma Rays
 The highest frequency of the EMS. Making
up 15% of the EMS, Very dangerous but
still can be used for cancer cures.

24. 20% 15% 13% 9
%
12% 16% 15%
The E.M.S.

25. Lab Time
 Carefully read and
complete each
activity from the lab
guide.
 You have 45
minutes

26. Essential Learnings
 All Electromagnetic waves
originally come from the sun

27. Essential Learnings
 All electromagnetic waves are
arranged on the electromagnetic
spectrum by wavelength and
frequency

28. Essential Learnings
 The Electromagnetic Spectrum
includes seven different types of waves
– Radio Waves
– Microwaves
– Infrared Waves
– Visible Light
– Ultraviolet Light
– X-Rays
– Gamma rays

29. Essential Learnings
 Radio waves are the lowest
energy level w/ lowest
frequency and have the longest
wavelength

30. Essential Learnings
 Gamma rays are the highest
level w/ highest frequency and
the shortest wavelength

31. Essential Learnings
 All types of electromagnetic
radiation travel at the speed of
light in space (which is a
vacuum).
 They differ at wavelengths and
frequencies

32. Essential Learnings
 Electromagnetic Radiation
travels as transverse waves
and does not require a medium
in which to travel

33. Essential Learnings
The End!