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OG18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-P460-608题】

The passage implies that if tunneling time reached no maximum in increasing with barrier thickness, then

  • 分析A选项
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  • 分析B选项
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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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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 11:09:31 感谢由 感觉自己萌萌哒 对此题目的解答所做出的贡献。
关键词定位:This would imply that once maximum tunneling time is reached, tunneling speed will increase without limit as barrier thickness increases.文中说的是如果时间达到最大值,速度会随着障碍物厚度的增加而无限扩大.题干问的是:tunneling time reached no maximum ,也就是说,速度不会随着厚度增加无限制扩大。选D
A tunneling speed would increase with barrier thickness 无从推测
B tunneling speed would decline with barrier thickness 无从推测
C tunneling speed would vary with barrier thickness 无从推测
D tunneling speed would not be expected to increase without limit
E successful tunneling would occur even less frequently than it does 无涉及

题目讨论 2条评论)

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    1123

    This would imply that once maximum tunneling time is reached, tunneling speed will increase without limit as barrier thickness increases.由于题目问的是 if tunneling time reached no maximum,那么tunneling speed就不会increase without limit。相当于是若A,则B;非A,非B。
    0 0 回复 2018-11-20 23:29:12
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    neilchang

    啥玩意,看不懂
    0 0 回复 2018-10-22 03:05:59
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