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Register now and save up to $200 Available with Beat the GMAT members only code • Get 300+ Practice Questions 25 Video lessons and 6 Webinars for FREE Available with Beat the GMAT members only code ## OG Most attempts by physicists to send This topic has 3 expert replies and 0 member replies AbeNeedsAnswers Master | Next Rank: 500 Posts Joined 02 Jul 2017 Posted: 191 messages Followed by: 2 members Upvotes: 1 #### OG Most attempts by physicists to send Thu Jul 27, 2017 9:13 pm 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(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 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. 541) The Author of the passage mentions calculations about tunneling time and barrier thickness in order to A) suggest that tunneling time is unrelated to barrier thickness B) explain the evidence by which Winger and Eisenbud discovered the phenomenon of tunneling C) describe data recently challenged by Raymond Chiao and colleagues D) question why particles engaged in quantum tunneling rarely achieve extremely high speeds E) explain the basis for Winger and Eisenbud's hypothesis 542) The passage implies that if tunneling time reached no maximum in increasing with barrier thickness, then A) Tunneling speed would increase with barrier thickness B) Tunneling speed would decline with barrier thickness C) Tunneling speed would vary with barrer thickness D) Tunneling speed would not be expected to increase without limit E) Successful tunneling would occur even less frequently than it does 543) Which of the following statements about the earliest scientific investigators of quantum tunneling can be inferred from the passage? A) They found it difficult to increase barrier thickness continually. B) They anticipated the later results of Chiao and his colleagues. C) They did not suppose that tunneling particles could travel faster than light. D) They were unable to observe instances of successful tunneling. E) They made use of photons to study the phenomenon of tunneling. Q541: E Q542: D Q543: C ### GMAT/MBA Expert DavidG@VeritasPrep Legendary Member Joined 14 Jan 2015 Posted: 2613 messages Followed by: 118 members Upvotes: 1153 GMAT Score: 770 Mon Jul 31, 2017 6:58 am Quote: 543) Which of the following statements about the earliest scientific investigators of quantum tunneling can be inferred from the passage? A) They found it difficult to increase barrier thickness continually. B) They anticipated the later results of Chiao and his colleagues. C) They did not suppose that tunneling particles could travel faster than light. D) They were unable to observe instances of successful tunneling. E) They made use of photons to study the phenomenon of tunneling. Towards the end of paragraph one, we get the following quote: 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. So the earlier investigators did not think that tunneling particles could travel faster than light. The answer is C _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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### GMAT/MBA Expert

DavidG@VeritasPrep Legendary Member
Joined
14 Jan 2015
Posted:
2613 messages
Followed by:
118 members
1153
GMAT Score:
770
Mon Jul 31, 2017 6:57 am
Quote:
542) The passage implies that if tunneling time reached no maximum in increasing with barrier thickness, then
A) Tunneling speed would increase with barrier thickness
B) Tunneling speed would decline with barrier thickness
C) Tunneling speed would vary with barrer thickness
D) Tunneling speed would not be expected to increase without limit
E) Successful tunneling would occur even less frequently than it does
We're told in paragraph 2 that once maximum tunneling time is reached, tunneling speed will increase without limit as the barrier thickness increases. Presumably, if there were no max tunneling time, then tunneling speed would not increase without limit. The answer is D

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Save $100 off any live Veritas Prep GMAT Course Enroll in a Veritas Prep GMAT class completely for FREE. Wondering if a GMAT course is right for you? Attend the first class session of an actual GMAT course, either in-person or live online, and see for yourself why so many students choose to work with Veritas Prep. Find a class now! ### GMAT/MBA Expert DavidG@VeritasPrep Legendary Member Joined 14 Jan 2015 Posted: 2613 messages Followed by: 118 members Upvotes: 1153 GMAT Score: 770 Mon Jul 31, 2017 6:54 am Quote: 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(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 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. 541) The Author of the passage mentions calculations about tunneling time and barrier thickness in order to A) suggest that tunneling time is unrelated to barrier thickness B) explain the evidence by which Winger and Eisenbud discovered the phenomenon of tunneling C) describe data recently challenged by Raymond Chiao and colleagues D) question why particles engaged in quantum tunneling rarely achieve extremely high speeds E) explain the basis for Winger and Eisenbud's hypothesis The calculations about tunneling time and barrier thickness help explain why a particle might travel faster than the speed of light. At the end of paragraph 1, we learn that this was hypothesized by Wigner and Eisenbud. The answer is E _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

Enroll in a Veritas Prep GMAT class completely for FREE. Wondering if a GMAT course is right for you? Attend the first class session of an actual GMAT course, either in-person or live online, and see for yourself why so many students choose to work with Veritas Prep. Find a class now!

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