Espalhamento © Slideshow by Jair LP
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Transcript of Espalhamento © Slideshow by Jair LP
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RAYLEIGH SCATTERING: THE BLUE SKY
AN ANIMATION BY JAIR lp
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Sirius – The Alan Parsons Project, 1982
SOUNDTRACK
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Espalhamento – céu azul
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Por que o céu é azul?
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Devido ao espalhamento de Rayleigh.
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Rayleigh?
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Espalhamento de Rayleigh
Lord Rayleigh (1842-1919)
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Espalhamento de Rayleigh
Quando a luz atravessa um meio que contém partículas muito menores que o seu comprimento de onda, parte da luz incidente é espalhada em várias direções.
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Espalhamento de Rayleigh
Essas partículas podem ser as moléculas
de nitrogênio (N2) e oxigênio (O2) do ar, ou íons sulfato (SO4
-2) e sódio (Na+) na água.
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Espalhamento na atmosfera
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Espalhamento - equação
Como o azul tem comprimento de onda inferior ao vermelho, ele é três vezes mais espalhado que o vermelho.
4
1
kI
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Espalhamento – céu azul
A luz solar branca incide sobre uma região da atmosfera que espalha preferencialmente a luz com frequências próximas à da cor azul.
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The end
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Slideshow by prof jair lp
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1ª edicão: Setembro 2009 ,
Edicão definitiva: junho 2013 ,
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