1. Light and Optics
Intro

2. Section 1: Intro to Electromagnetic Waves
Intro Questions:
What is the difference between mechanical and electromagnetic waves?
Name as many types of electromagnetic waves you can
What is the speed of light and any other electromagnetic wave in space?

3. The Electromagnetic Wave
Characteristics:
Require no medium
Transverse waves of oscillating electromagnetic fields
Transverse waves move perpendicular to the direction the wave moves
The electric and magnetic fields are at right angles to each other
All electromagnetic waves travel at 3.0 x 108 m/s
Electric Field
Direction of travel towards you
Magnetic Field

4. 3.0 x 108 = λ • f V = λ • f The Electromagnetic Spectrum
Wavelength Decreases
Frequency Increases
Energy Increases
3.0 x 108 = λ • f
V = λ • f
More Penetration and Dangerous
Velocity = 3.0 x 108 m/s
For All Electromagnetic Waves

5. Section 2: Electromagnetic Wave Math
V = λ • f
Speed of light distance-time calculations
Velocity = 3.0 x 108 m/s for all electromagnetic waves
If you see any of these you have an electromagnetic wave and v = 3.0 x 108 m/s
Radio Waves, Microwaves, Infrared, Visible Light, Ultra Violet, X-rays, Gamma Rays

6. Example 1
The AM radio band extends from 5.4 x 105 Hz to 1.7 x 106 Hz. What are the longest and shortest wavelengths in this frequency range?

7. Example 1
The AM radio band extends from 5.4 x 105 Hz to 1.7 x 106 Hz. What are the longest and shortest wavelengths in this frequency range?

8. Example 2
What is the frequency of an electromagnetic wave if it has a wavelength of 1.0 km?

9. Example 2
What is the frequency of an electromagnetic wave if it has a wavelength of 1.0 km?

10. Example 3
How long does it take for light from the sun to reach Earth if the sun is 1.5 x 1011 m away?

11. Example 3
How long does it take for light from the sun to reach Earth if the sun is 1.5 x 1011 m away?

12. Radio waves Longest wavelength EM waves, low frequency, low energy
Uses:
TV broadcasting
AM and FM broadcast radio
Avalanche beacons
Heart rate monitors
Cell phone communication
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

13. Microwaves Wavelengths from 1 mm- 1 m Uses: Microwave ovens
Bluetooth headsets
Broadband Wireless Internet
Radar
GPS
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

14. Infrared Radiation Wavelengths in between microwaves and visible light
Uses:
Night vision goggles
Remote controls
Heat-seeking missiles
Heat lamps
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

15. Visible light
Only type of EM wave able to be detected by the human eye
Violet is the highest frequency light
Red light is the lowest frequency light
ROYGBIV
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

16. Ultraviolet Shorter wavelengths than visible light Uses: Black lights
Sterilizing medical equipment
Water disinfection
Security images on money
There is one more UV slide…

17. X-rays Tiny wavelength, high energy waves Uses: Medical imaging
Airport security
Inspecting industrial welds
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

18. Gamma Rays Smallest wavelengths, highest energy EM waves Uses
Food irradiation
Cancer treatment
Treating wood flooring
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram