1. The Electromagnetic Spectrum
9/9/18

2. OSCILLATION Movement back and forth at a regular speed
In the case of electromagnetic waves the oscillation move all at the same speed.

3. ELECTROMAGNETIC WAVES
All electromagnetic waves are the same
The only difference between all is their frequency of oscillation. This means the energy that each electromagnetic wave is capable of depositing in matter.
REMEMBER all waves have the same speed. Speed of light.

4. The Many Uses of Electromagnetic Wave Phenomenon in Our Daily Lives.

5. Radio Waves Longest wavelength
Primarily used in radio and television communication
Also used in radar systems, and satellites

6. NOTES on antennas and Radio Waves

7. Microwaves Most familiar with the use of a microwave for cooking.
This Photo by Unknown Author is licensed under CC BY

8. Microwaves Microwaves are also used in: 1. aircraft navigation
2. Radar
3. scientific research

9. Infrared (IR) waves Wavelength longer than visible light
Readily absorbed and emitted by most materials.

10. Infrared (IR) waves
When absorbed objects get hotter by increasing the kinetic energy of atoms and molecules

11. Infrared (IR) waves
IR application include in meteorology, night-vision devices, communication, and astronomy.

12. Detectable by the human eye Ranges from Violet to Red
Visible light
Detectable by the human eye
Ranges from Violet to Red

13. Human eyes are not equally sensitive to all wavelengths
Visible Light
Human eyes are not equally sensitive to all wavelengths

14. NOTES on visible spectrum

16. NOTES on visible spectrum

17. NOTES selective absorption and reflection

18. Ultraviolet (UV) Light
Sun is a significant source of UV light
The atmosphere absorbs most of the UV light

19. Ultraviolet (UV) Light
Large amounts of UV light is harmful to humans
Use in the sterilization of medical instruments

20. Sterilization
The process of making something free from bacteria or other living microorganisms

21. X-rays
Most familiar application of X-rays is in medicine for the examination of the bones.
X-rays are energetic enough to be harmful to living tissue
This Photo by Unknown Author is licensed under CC BY-ND

22. Gamma Rays
Highly penetrating waves that are emitted by radioactive nuclei
Extremely hazardous to living tissue and cause irreversible damage if absorbed.

23. Gamma Rays
Yet, this energy can be used to destroy harmful cells such as cancerous tumors.