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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?！惫磐駚?lái)，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(wú)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(wèn)：落日為什么是紅色的呢？我們來(lái)看看下面這篇文章是怎么說(shuō)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 longerwavelengthsare 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 smallparticlesof dust or water. These particlesreflectlight 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(yǔ)點(diǎn)津 Annabel 編輯）
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