1. Electromagnetic
Radiation (Light)

2. Electromagnetic Radiation
Characteristics of
Electromagnetic Radiation
Produced by the motion of electrically charged particles moving back and forth.

3. Electromagnetic Radiation
Characteristics of
Electromagnetic Radiation
The charged particles are surrounded by:
Electric fields
Magnetic fields

4. Electromagnetic Radiation
Characteristics of
Electromagnetic Radiation
Transverse waves
Do not require a medium

5. Electromagnetic Radiation
Characteristics of
Electromagnetic Radiation
All electromagnetic waves Travel at 300,000,000 m/s in a vacuum
Nothing travels faster than the speed of light!

6. Electromagnetic Radiation
Characteristics of
Electromagnetic Radiation
Travels slower when passing through a medium

7. Electromagnetic Radiation
Duel Nature of
Electromagnetic Radiation
Particle nature
Travels in bundles of energy
Bundles act like small particles
Called photons

8. Electromagnetic Radiation
Duel Nature of
Electromagnetic Radiation

9. Electromagnetic Radiation
Duel Nature of
Electromagnetic Radiation
Wave nature
All electromagnetic waves travel at the same speed
Frequency and wavelength are used to classify the waves in the electromagnetic spectrum

10. Electromagnetic Spectrum
The electromagnetic spectrum is the complete range of electromagnetic waves placed in order of increasing frequency.

11. Electromagnetic Spectrum

12. Electromagnetic Spectrum

13. As the frequency increases: Wavelength decreases
Electromagnetic Spectrum
As the frequency increases:
Wavelength decreases
Photon penetrating energy increases

14. Radio Waves
Uses: Communication (telephones, pagers, radio transmission, global positioning system
Long wavelength and Low frequency
Lowest Photon energy

15. Radio Waves

16. Microwaves Uses: Cooking, cellular phones, radar
Long wavelength and Low frequency
Lower Photon energy

17. Infrared Radiation
Wavelength is only a little longer than visible light
Uses – Remote controls, thermal energy transfer (radiant energy) including night vision, infrared photography, locating tumors
(Remember all living objects give off infrared radiation.)

18. Infrared Radiation

19. Visible Radiation
Only wavelengths that can be detected by the human eye
Use – allow humans to see

20. Ultraviolet Radiation
Higher frequency and shorter wavelength than visible radiation
Uses– Produces vitamin D in human skin and can be used to kill bacteria and viruses (sterilize equipment)
Warning! – too much can cause skin cancer; Ozone in the atmosphere blocks it

21. X-rays Higher frequency and photon energy – greater penetrating power
Uses: X-ray pictures; rays will penetrate soft matter like skin and muscle, but it is absorbed by the harder bones

22. Gamma Rays Highest frequency -- greater penetrating power
Uses: destroy human cells and can be used to kill cancerous cells

23. Review
Get ready!

24. What produces electromagnetic radiation?
Review
What produces electromagnetic radiation?

25. What type of wave is electromagnetic radiation?
Review
What type of wave is electromagnetic radiation?

26. Name a wave that can travel faster than electromagnetic radiation?
Review
Name a wave that can travel faster than electromagnetic radiation?

27. Review
What is a photon?

28. Name the longest electromagnetic wave.
Review
Name the longest electromagnetic wave.

29. Review
What name do we give to all the electromagnetic waves arranged from longest wavelength to shortest wavelength?

30. Name electromagnetic wave used to see a child in a burning house.
Review
Name electromagnetic wave used to see a child in a burning house.

31. Concept Map