2. What is light?

3. What is light? Electromagnetic Radiation/Energy Wave-particle duality
It is both a wave and a particle at the same time
“Packet” of light energy is a photon

4. What is color?
You perceive something as being a certain color because that is the light the object is reflecting.

5. Color
Black shirts are hot in the summer because black objects absorb all color frequencies.
White shirts are cool in the summer because white objects reflect all color frequencies.
Clear objects do not reflect light back at you.

6. Bill Nye: Light and Color

7. Intro to the Electromagnetic Spectrum

8. Electromagnetic Spectrum
(Light)

9. Electromagnetic Spectrum
Light is not just what we can see
Refers to all forms of EM radiation

10. Electromagnetic Spectrum
Transverse Waves
Do not need a medium
All forms travel at the same velocity
About 300,000 m/s in the vacuum of space
Travel much faster than sound

11. Electromagnetic Spectrum
Higher Frequencies = Higher Energy
Lower Wavelengths = Higher Energy

12. Some Uses of EMS

13. Photoelectric Effect
Albert Einstein won the Nobel Prize in 1921 for the discovery
As a light ray hits the surface of a material, it can knock electrons out
This movement of electrons can generate electricity
How solar panels work