why is the sky blue?
Post on 02-Jan-2016
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Why Is the Sky Blue?
How does light scatter?
Why Is the Sky Blue?
Light travels in a straight line until it hits matter
Air is not empty; it contains oxygen, nitrogen, carbon dioxide and particles
When sunlight strikes a oxygen or nitrogen molecule, the molecule vibrates
What is Scattering?
o A light beam strikes an atom and excites electrons to a higher energy orbital
What is Scattering?
o The electrons briefly stay at the higher energy orbital then jump back down and reemit the light in many different directions
Air components scatter the high-frequency light
Why Is the Sky Blue?
How Do Our Eyes Detect Color?o Our eyes have
over 120 million rods and cones on our retina
o These receptors process light
Color and Our Eyes Continuedo Rods transmit
black and white images
o Cones transmit color and sharpness
Color, Our Eyes and Rods Continued
• We have more sensitivity with green sensing cones than red or blue
Why Is the Sky Blue?
Violet light is scattered the most by air and particles
But we have a hard time seeing violet
Blue light is second most scattered light
Why Is the Sky Blue?
Think-Pair-Share
Your Turn….
Why are Clouds White?
Clouds are made up of water droplets
The droplets vary in size
Small droplets scatter high frequencies like violet while large ones scatter low frequency light like red
Why are Clouds White?
A wide variety of color frequencies are scattered
The overall result is a white cloud
SmartBoard ExerciseWhy is the Sunset Red?
Homework
Read pp. 570-573
Answer Ques. 18, 20, 39, 40
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