Blue light tints the sky blue ??
佳木斯市第五中学 赵延荣
Text
WHY is a clear, cloudless daytime sky blue? Don’t think this question is foolish. You’ll learn a lot about colour if you get the answer. A thick atmosphere (厚厚的大气层) goes around the earth. We are living at the bottom (底部) of all that air. There are dusts (灰尘), water drops and other small particles (颗粒) in the atmosphere . Sunlight passes through this thick air to reach the earth. It is made of lights of different colours. As sunlight travels through the atmosphere and meets particles, some of it scatters (散射). Are different lights scattered the same? No. Short wavelength (波长) light scatters more than long wavelength light. Light has different colours at different wavelengths. The wavelength of blue light is very short. It is about half the wavelength of red light, which is the longest. Blue light is scattered almost 10 times as strongly as red light. As blue light travels through the atmosphere it is scattered in all directions. So, blue everywhere in the sky!
Curriculum focus: ? Scientific awareness: Getting to
know why everything has its own colour. ? Language study: Learning words
through context, and learning prepositional phrases.
Pre-reading

  1. Have you noticed that everything has colour? Have you thought about why this happens?
  2. What is scattering?

  3. What do you know about light?
While reading

  1. There are in the atmosphere ? A. dusts , water drops and other small particles B. all kinds of lights. C. all kinds of color. D. blue sky.
  2. The wavelength of blue light is ? A. very long B. very short
  3. In which direction is blue light scattered? A.scattered straight B. in all directions

  4. We live where in all that air ? A. at the top B. at the bottom C. in the middle
  5. goes around the earth. ? A. A thick atmosphere goes around the earth. C. Light goes around the earth. D. Nothing goes around the earth.

  6. Are different lights scattered the same? A. Yes.Short wavelength light scatters the same as long wavelen B. No. Short wavelength light scatters more than long waveleng C. No. Short wavelength light doesn’t scatter.
Fill in the blanks with the proper words
same Are different lights scattered the ? No. Short wavelength (波长) light scatters than long more wavelength light. Light has different colours different wavelengths. in The wavelength of blue light is very short. It is about half the wavelength of red light, which is the longest. Blue light is scattered almost 10 times as strongly __ red light. as As blue light travels through the atmosphere it is scattered all directions. So, blue everywhere in the sky! in
Useful phrases
go around 围绕 转 围绕…转 The moon goes around the earth.
  2. At the bottom of 在底部 There is something strange at the bottom of that bottle of milk.
  3. Be made of 由 … 组成 This kind of sweater is made of wool.
  4. As … as 与…一样 一样 I am as tall as my brother. He ran as fast as he could to chase the bus.
  1.
Grammar Point
介词短语的用法
  1.at 介词at表时间、表地点。 (
  1)at表示时间,用于钟点前,用于时刻前,译为" 在......时”。 (
  2)at表示地点,一般用于较小的地名(方)前, 译为"在......"。 (
  3)at表示处于......状态,译为“从事于......”。

  2.in 小小介词in,用途却很多。可表时间,表地点,表 手段、方法、材料。 (
  1)in表示时间,用于泛指一天的上午、下午、 晚上等;用于某个较长的时间,如年、月、季节 等。 另外,in和at都可以表示时间,但in表示较长的时 间,而at表示时间的某一点。 (
  2)in表示地点、场所,译为"在......里"、"在...... 中"。 (
  3)in表示用语言,用......材料。译为"用......, 以......方式"。 (
  4)in表示穿戴的状态,译为"戴着、穿着"。
3 on
  3.on 介词on表示时间、地点、方位等。 on (
  1)on表示时间,用于星期、日期(包括该天 的各部分)。on也用于某一日的名词前,用于 公共节假日前。
 

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