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  3. 學習啦>學習方法>各學科學習方法>閱讀答案>《最黑的東西有多黑閱讀題答案》正文

    最黑的東西有多黑閱讀題答案

    時間:2015-10-12 14:49:39本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 淑航 我要投稿

      世上最黑的東西是什么呢,你知道嗎?下面是學習啦小編收集整理的《最黑的東西有多黑》的閱讀題目及其參考答案以供大家學習。
     

      《最黑的東西有多黑》閱讀原文:

      世界上什么東西最黑?你或許會說,這個問題有些荒唐,因為黑的就是黑的,淺黑就是灰的,哪有什么最黑?其實你錯了!因為在科學家眼里,黑與黑也有分別。如一般的黑炭,或者被人造黑漆涂抹的東西,其黑色只能吸收可見光,但不能吸收紅外線和紫外線,所以用紅外望遠鏡就能看到它們。但有一種材料,紅外望遠鏡也看不到它,因為它把紅外線、紫外線統統都吸收了,壓根就不反射任何頻率的光,正因為如此,這種材料在人的肉眼,甚至靈敏的觀測儀看來,都是黑色的東西,而且是目前世界上最黑的東西。

      當然,這種黑材料不是天然的,而是美國科學家研制出的一種特殊材料。實驗證實,這種材料能99.5%地吸收紫外線、可見光和紅外線。雖然之前也有性能接近完美的吸收光的材料,但那些材料只在吸收紫外線和可見光波段有效,和這種新材料相比差‘了將近100倍。新材料雖然作用獨特,但其構成并不十分神秘,它實際上就是一種中空的純碳元素構成的管狀體,厚度是人頭發絲直徑的萬分之一。它們本身具有吸附性,可以垂直附著于不同的材料表面,就像地毯上的毛可以垂直附著于地毯上一樣。如果把它們涂抹在硅、鈦和不銹鋼的表面,那么這些材料就變成了世界上最黑的東西了。

      你或許會感到奇怪,科學家為什么要挖空心思去制造最黑的東西呢?因為這種材料對發展太空事業實在是太重要了。它的一項重要應用就是抑制散光,因為附著在太空設備表面的這種材料,可以收集并阻滯來自不同方向的光線,并阻止其從表面反射出去,這就有利于科學家們看清楚太空設備周圍出現的新東西或新情況。就好比我們要觀測一個淺色東西,如果放在白紙上看,就遠不如放在黑紙上看得清楚,因為白紙能反射環境光,不利于看清楚物體。因此,這種材料一旦投入使用,它將極大地提高人類對太空的觀測水平。而研究地球大氣和海洋的科學家們也將從中受益,因為對地觀測設備接收到的光信號中有90%來自大氣散射所產生的“雜光”,從而掩蓋了人們對地面設備的觀測。如果地面設備涂上這種黑色材料,真正“變黑”,那么就不會產生“雜光”,自然就容易被觀測到。

      黑色材料在飛船設備方面還有一項重要應用,這對于飛船上的紅外探測設備更加重要。如果材料越“黑”,它就越不能反光,因此把這種材料涂抹在結構復雜的紅外探測設備上,就能確保設備的冷卻,從而保證設備對暗弱深空天體信號的敏銳捕捉。此前,科學家研制出一種黑色材料,盡管那種材料冷卻設備的效果不錯,但卻會因為材料自身比較重而增加航天器的總重量。而這種新的黑材料不僅重量輕,而且性能也更優越,所以它必將是一種非常有前景的新材料。

     

      《最黑的東西有多黑》閱讀題目:

      1.這種最黑的新材料,在實踐運用中有哪些作用?請依據文本內容分條歸納。

      2.第一段中的畫線語句在文中有什么作用?

      3.下面這句話使用了什么說明方法?有什么作用?

      它實際上就是一種中空的純碳元素構成的管狀體,厚度是人頭發絲直徑的萬分之一。

     

      《最黑的東西有多黑》閱讀答案:

      1.①能抑制散光,利于看清太空設備周圍出現的新東西或新情況;②能保證飛船上的紅外探測設備對暗弱深空天體信號的敏銳捕捉;③利于研究地球大氣和海洋的科學家們觀測地面設備。

      2.①結構上:設置懸念,引起讀者的閱讀興趣;②內容上:由人們的疑惑引出本文的說明對象。

      3.說明方法:作比較,列數據。

      作用:通過將這種新材料與人頭發絲直徑的對比,可以使讀者更清晰、具體、真切地感知到這種新材料的厚度之小。

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