Colors in Nature. Dispersion of Light in a Prism Colors separate Violet has the highest ƒ (shortest...
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Transcript of Colors in Nature. Dispersion of Light in a Prism Colors separate Violet has the highest ƒ (shortest...
Colors in Nature
Dispersion of Light in a Prism Colors separate Violet has the highest ƒ
(shortest λ), therefore it disperses the most because it interacts the most with the glass molecules.
Dispersion- the separation of white light according to its colors (frequencies)
The Atmosphere Surrounding the Earth Light travels through
millions of meters of nothingness until it starts to encounter the earth’s atmosphere
Gas Composition of Earth's atmosphere:
Nitrogen -78% of atmosphere
Oxygen - 21% of atmosphere
Trace gases -1% - Neon, Helium, Hydrogen, Methane, Carbon Dioxide
What happens to sunlight when it first encounters Nitrogen and Oxygen molecules
The Surface of the Moon (where there is no atmosphere)
Scattering of Light by Molecules(Why the Sky is Blue)
Nitrogen and Oxygen are relatively small molecules. The lower frequencies of light (red, orange, yellow) are not affected by the tiny molecules. Violet gets scattered the most, indigo next and then blue. Our eyes are more sensitive to blue, so we see the sky as being blue, not violet.
Why are Sunsets and Sunrises Orangish-Red?
How are Rainbows Formed?
Recall: Dispersion 2 Conditions needed
for a rainbow1) Sun in one part of the sky2) Rain in another part
of the sky
….and You in Between!
According to one unknown child……….
COLOR
The Color Spectrum… All color is a derivative of white light!!
Vocabulary
Dye – a molecule that absorbs certain wavelengths of light and transmits or reflects other.
Pigment – (like dye only larger) is a colored material that absorbs certain colors and transmits or reflects others
Color vs. PigmentColor by
Addition (Light) Add all colors of light… get white
Subtraction (Pigment) Dye absorbs certain wavelengths… That is to say it “subtracts” them Add dye… subtract color
Primary Colors
Primary Colors – They lied! RED GREEN BLUE
Secondary Colors Cyan Magenta Yellow
Primary Pigments
Primary Pigments Cyan Magenta Yellow
Secondary Pigments RED GREEN BLUE
Homework
Read 28.1 – 28.6 Complete Page 12 of Packet.
(Do NOT do # 26)