The passage implies that if tunneling time reached no maximum in increasing with barrier thickness, then_请教张慧雯老师，本题我的定位点和思路：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 未达到最大时，厚度越大时间越长，那不就是厚度越大速度越慢吗？所以我选的B ，请老师指出我的问题出国考试答疑器_GMAT

[Reading Comprehension]

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文章：

Line	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
(5)	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
(10)	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
(15)	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
(20)	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
(25)	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
(30)	an optical filter at 1.7 times the speed of light.

题目：

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

选项:

A、tunneling speed would increase with barrier thickness

B、tunneling speed would decline with barrier thickness

C、tunneling speed would vary with barrier thickness

D、tunneling speed would not be expected to increase without limit

E、successful tunneling would occur even less frequently than it does

提问：

请教张慧雯老师，本题我的定位点和思路：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 未达到最大时，厚度越大时间越长，那不就是厚度越大速度越慢吗？所以我选的B ，请老师指出我的问题

解答：

阅读1048

解答：张慧雯

提问：

解答：

阅读1049

解答：张慧雯老师

提问：

请问根据原文 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 未达到max时，厚度越大时间越长，那不是暗示厚度越大速度越慢吗，所以我选的B

解答：

阅读1273

解答：王文静老师

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