1. Light
A form of energy that stimulates the eye and makes it possible to see things.

2. Light travels as a Ray
The straight pathway of light.

3. Speed of Light Waves Light travels extremely fast compared to sound.
It takes light less than 8 ½ minutes to travel 150 million km to Earth.

4. Parts of a Transverse Light Wave
Wavelength: The distance between two crests.
Crest: The top point of a wave. Also called a peak.
Trough: The bottom point of a wave.

5. Parts of a Compression Sound Wave
Wavelength: The distance between two compressions.
Compressions: Part of wave where molecules are close together.
Rarefactions: Parts of wave where molecules are spread apart.

6. Compare and Contrast Sound and Light Waves
Both

7. White Light
Light that appears to be white but really contains all of the colors of the visible spectrum.
White light is a combination of the visible spectrum.

8. Visible Light Represented by colors.
You can remember these colors by the name
ROY G BIV.
R- Red
O- Orange
Y- Yellow
G- Green
B- Blue
I- Indigo
V- Violet

9. Each color has a different size wavelength.
This is what lets our eyes see different colors.
Red - Has the longest wavelength
Violet – Has the shortest wavelength

10. Visible Spectrum
Bands of colored light that appear when white light is passed through a prism.

11. Electromagnetic Spectrum
All bands of light and light-like energy
The Space Place :: See all the Cosmic Colors!

12. Behavior of Light Waves
Light can bounce (reflect ) off of objects
Light can bend (refract) as it enters different states of matter
Light can pass through objects (be transmitted)
Light can be absorbed as heat

13. How much light passes through?
Opaque: a material that reflects or absorbs light that strikes it
Light cannot pass through
Cannot see through it
Example: wood

14. How much light passes through?
Transparent: a material that transmits light
Light passes through it, no reflection
Can see what is on the other side
Examples: clear glass

15. How much light passes through?
Translucent: a material that allows some light to pass through it
Scatters light as it passes through, no reflection
Can see objects through it, but not clearly
Examples: frosted glass, wax paper

16. Refraction Refraction The bending of waves due to change in speed
If white light is bent it turns into the visible spectrum
If the visible spectrum is bent it turns back to white light

17. What makes a rainbow?
Water droplets act like a prism and separate white light.