why is the sky blue?
DESCRIPTION
Why Is the Sky Blue?. How does light scatter?. Why Is the S ky 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. - PowerPoint PPT PresentationTRANSCRIPT
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Why Is the Sky Blue?
How does light scatter?
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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
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What is Scattering?
o A light beam strikes an atom and excites electrons to a higher energy orbital
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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
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Air components scatter the high-frequency light
Why Is the Sky Blue?
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How Do Our Eyes Detect Color?o Our eyes have
over 120 million rods and cones on our retina
o These receptors process light
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Color and Our Eyes Continuedo Rods transmit
black and white images
o Cones transmit color and sharpness
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Color, Our Eyes and Rods Continued
• We have more sensitivity with green sensing cones than red or blue
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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
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Why Is the Sky Blue?
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Think-Pair-Share
Your Turn….
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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
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Why are Clouds White?
A wide variety of color frequencies are scattered
The overall result is a white cloud
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SmartBoard ExerciseWhy is the Sunset Red?
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Homework
Read pp. 570-573
Answer Ques. 18, 20, 39, 40