為什么落日的余暉是紅色的？（通訊員稿）
[ 2006-11-06 10:25 ]
“一道殘陽(yáng)鋪水中，半江瑟瑟半江紅。”古往今來，人們不知留下了多少關(guān)于夕陽(yáng)的優(yōu)美詩(shī)篇，如火的夕陽(yáng)賦予了人們無限的遐想與靈感。在欣賞這些美妙詩(shī)篇的同時(shí)，不禁產(chǎn)生一個(gè)一問：落日為什么是紅色的呢？我們來看看下面這篇文章是怎么說的吧！
 As the sun begins to set, the light must travel
farther through the atmosphere before it gets to you. More of the light is
reflected and scattered. As less reaches you directly, the sun appears less
bright. The color of the sun itself appears to change, first to orange and then
to red. This is because even more of the short wavelength blues and greens are
now scattered. Only the longer wavelengths are left in the direct beam that
reaches your eyes.
The sky around the setting sun may take on many colors. The most spectacular
shows occur when the air contains many small particles of dust or water. These particles
reflect light in all directions.
Then, as some of the light heads towards you, different amounts of the shorter
wavelength colors are scattered out. You see the longer wavelength, and the sky
appears red, pink or orange.
wavelength: 波長(zhǎng)
particle: 微粒
reflect: 反射
（北京林業(yè)大學(xué)通訊員林宇供稿 英語點(diǎn)津 Annabel 編輯）
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