1. Electromagnetic Radiation

4. Waves… a review Most waves are either longitudinal or transverse.
Sound waves are longitudinal.
But all electromagnetic waves are transverse…

5. ? ?
Prompt students to guess what the teal box, then the blue box, is hiding. (Wavelength, Amplitude)

6. Electromagnetic Spectrum BBC Video Clip

7. What does this picture show about the relationship between frequency and wavelength?

8. Types of EM Radiation
Radiowaves
lowest energy EM radiation

9. Electromagnetic waves
Produced by the movement of electrically charged particles
Can travel in a “vacuum” (they do NOT need a medium)
Travel at the speed of
light
Also known as EM waves

10. Clicking the little rainbow box at the top of each slide will bring you back to this one

11. Radio waves Longest wavelength EM waves Uses: TV broadcasting
AM and FM broadcast radio
Heart rate monitors
Cell phone communication
MRI (MAGNETIC RESONACE IMAGING)
Uses Short wave radio waves with a magnet to create an image
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

12. 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

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

14. 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
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

15. Ultraviolet Uses: Shorter wavelengths than visible light Black lights
Security images on money
Harmful to living things
Used to sterilize medical equipment
Too much causes sun burn
Extremely high exposure can cause skin cancer
There is one more UV slide…

16. X-rays Uses: Tiny wavelength, high energy waves Medical imaging
Airport security
Moderate dose can damaging to cells
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

17. Gamma Rays Uses Smallest wavelengths, highest energy EM waves
Sterilizes medical equipment
Cancer treatment to kill cancer cells
Kills nearly all living cells.
Click the little rainbow box in the top right corner to return to the overview EM spectrum diagram

18. Extention
Catch a Wave – Discovery Education Exploration