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OG20官方指南,建议同学们刷3遍。第一遍做题了解题型和考点,第二遍精刷,第三遍集中解决疑难问题。建议考生第一遍刷题采用官方正版纸质书籍,若遇到疑难问题,欢迎在此专区查阅解析,提供解析,参与题目讨论,与所有考生一起解决疑难问题。
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Most attempts by physicists to send particles faster than the speed of light involve a remarkable phenomenon called quantum tunneling, in which particles travel through solid barriers that appear to be impenetrable. If you throw a ball at a wall, you expect it to bounce back, not to pass straight through it. Yet subatomic particles perform the equivalent feat. Quantum theory says that there is a distinct, albeit small, probability that such a particle will tunnel its way through a barrier; the probability declines exponentially as the thickness of the barrier increases. Though the extreme rapidity of quantum tunneling was noted as early as 1932, not until 1955 was it hypothesized—by Wigner and Eisenbud—that tunneling particles sometimes travel faster than light. Their grounds were calculations that suggested that the time it takes a particle to tunnel through a barrier increases with the thickness of the barrier until tunneling time reaches a maximum; beyond that maximum, tunneling time stays the same regardless of barrier thickness. This would imply that once maximum tunneling time is reached, tunneling speed will increase without limit as barrier thickness increases. Several recent experiments have supported this hypothesis that tunneling particles sometimes reach superluminal speed. According to measurements performed by Raymond Chiao and colleagues, for example, photons can pass through an optical filter at 1.7 times the speed of light.

【OG20-P460-607题】

The author of the passage mentions calculations about tunneling time and barrier thickness in order to

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该题目由网友drl2uh6T提供。更多GMAT题目请
暂无雷哥网文字解析
当前版本由 感觉自己萌萌哒 更新于2015-11-03 11:09:51 感谢由 感觉自己萌萌哒 对此题目的解答所做出的贡献。
作用题
通过文章结构,我们知道计算tunneling time and barrier thickness是Wigner and Eisenbud’s hypothesis的根据,所以就是为了解释或者支持他们的假设。选E
A suggest that tunneling time is unrelated to barrier thickness
原文相反,文中是the time it takes a particle to tunnel through a barrier increases with the thickness of the barrier until tunneling time reaches a maximum,时间是跟厚度有关的,知道达到最大值
B explain the evidence by which Wigner and Eisenbud discovered the phenomenon of tunneling
原文不符,1932年就已经提出,1955年这两个人只是假设猜测了
C describe data recently challenged by Raymond Chiao and colleagues
原文相反。Raymond 也是支持W&E观点的
D question why particles engaged in quantum tunneling rarely achieve extremely high speeds
无涉及,全文的主旨都是在讨论为什么可以达到一个high speed,无涉及质疑
E explain the basis for Wigner and Eisenbud’s hypothesis

题目讨论 4条评论)

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    小火火火箭

    主要是前面提到这两人提出的是假说,所以肯定没有实验的证据,而且ground和basis差不多
    0 0 回复 2019-10-10 11:10:43
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    700加我来辣

    每一个单词我都认识,连起来都不知道是啥,是英语吗
    0 0 回复 2019-09-10 14:45:22
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    玛德琳冲鸭

    Their grounds were calculations that,这里的ground 就是basis的意思
    0 0 回复 2019-08-16 19:51:21
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    冲鸭冲鸭冲鸭

    选项B, discovered错,文中W&E只是noted and hypothesized并没有discovered。还有。。。OG19 P425 answer key竟然有错误。。跟后面对应题的解析答案都不一样 迷
    0 0 回复 2018-10-20 03:57:09
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