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10 May 2023, 07:30
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Question 1
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
78% (02:23) correct
22%
(02:54) wrong
based on 153
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
72% (01:06) correct 28%
(01:02) wrong
based on 148
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
64% (01:20) correct 36%
(01:18) wrong
based on 141
sessions
History
Date
Time
Result
Not Attempted Yet
Quantum mechanics is a relatively new field of physics that was developed in the early 1900’s. Although we classically think of a particle as a fixed object, quantum mechanics describes particles as waves using properties such as position and energy. The quantum mechanical wave describes the probability of a particle to attain certain values of these properties, and measuring the particle samples from this probability. Take, for example, the analogy of rolling a six-sided die. For each roll there is a one-in-six chance that any single number will result. After rolling, however, only one single number will be observed. If the die is rolled enough times, one can deduce that the die has six sides and that each side is equally likely. However, one can never be completely sure, because rolling dice is probabilistic in nature. Quantum mechanics states that the same is true of the position (and other properties) of a particle. A particle trapped in a closed box has some finite probability of being at any location within the box. Open the box once and you’ll find the particle at only one location. Open the box enough times and you’ll see all the particle locations and the frequency at which they are achieved. From this, one can deduce the original properties of the quantum mechanical wave, just as one could deduce the properties of the die.
The counterintuitive properties of quantum mechanics, that the attributes of a particle cannot be known in advance of measurement, initially provoked many strong philosophical debates and interpretations regarding the field. In fact, Einstein was deeply troubled by the idea of nature being probabilistic and commented famously that, “God does not play dice with the universe.” Over the last 70 years, however, irrefutable evidence has abounded that verifies the truth of the theory of quantum mechanics.
The counterintuitive properties of quantum mechanics, that the attributes of a particle cannot be known in advance of measurement, initially provoked many strong philosophical debates and interpretations regarding the field. In fact, Einstein was deeply troubled by the idea of nature being probabilistic and commented famously that, “God does not play dice with the universe.” Over the last 70 years, however, irrefutable evidence has abounded that verifies the truth of the theory of quantum mechanics.
1. Which of the following best expresses the main idea of the passage?
(A) Particles are not a fixed object but rather waves.
(B) Controversial theories are often found to be correct.
(C) Quantum mechanics correctly postulates the probabilistic nature of particles.
(D) Many questions still exist about the nature of particles and quantum mechanics.
(E) Experiments can be designed to test the quantum mechanical nature of particles.
(A) Particles are not a fixed object but rather waves.
(B) Controversial theories are often found to be correct.
(C) Quantum mechanics correctly postulates the probabilistic nature of particles.
(D) Many questions still exist about the nature of particles and quantum mechanics.
(E) Experiments can be designed to test the quantum mechanical nature of particles.
2. Based on the information in the passage, which of the following would best explain Einstein’s motivation for stating that “God does not play dice with the universe”?
(A) Einstein did not believe that particles should be governed by probability as in a game of dice.
(B) Einstein believed that God should control the fate of the universe.
(C) Einstein was opposed to the theory of quantum mechanics on the grounds that it violated causality.
(D) Einstein’s religious beliefs did not allow him to fully understand the theory of quantum mechanics.
(E) Einstein believed that God created the universe such that particles would be modeled probabilistically as in quantum mechanics.
(A) Einstein did not believe that particles should be governed by probability as in a game of dice.
(B) Einstein believed that God should control the fate of the universe.
(C) Einstein was opposed to the theory of quantum mechanics on the grounds that it violated causality.
(D) Einstein’s religious beliefs did not allow him to fully understand the theory of quantum mechanics.
(E) Einstein believed that God created the universe such that particles would be modeled probabilistically as in quantum mechanics.
3. Which of the following can be properly inferred based on the information in the passage?
I. The location of a particle within a closed box cannot be known for certain without observing the particle.
II. Properties such as position and energy of a particle can never be measured.
III. Particles can be properly described as quantum mechanical waves.
A. I Only
B. III Only
C. I and III Only
D. II and III Only
E. I, II, and III
I. The location of a particle within a closed box cannot be known for certain without observing the particle.
II. Properties such as position and energy of a particle can never be measured.
III. Particles can be properly described as quantum mechanical waves.
A. I Only
B. III Only
C. I and III Only
D. II and III Only
E. I, II, and III
RC Butler 2023 - Practice Two RC Passages Everyday.
Passage # 142 Date: 10-May-2023
This question is part of RC Butler 2023. Click here for Details
Passage # 142 Date: 10-May-2023
This question is part of RC Butler 2023. Click here for Details
Manhattan GRE 5lb.
20 Sep 2023, 09:17
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Can you please provide explanation for Q3?
21 Sep 2023, 12:56
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abhishektyga
Official Explanation
3. Which of the following can be properly inferred based on the information in the passage?
Explanation
The first statement is a proper inference because passage states that A particle trapped in a closed box has some finite probability of being at any location within the box, meaning the exact location of the particle cannot be known. You know from the next sentence that opening the box will locate the particle, and thus you can deduce that the location cannot be known for certain without observing the particle. The second statement is incorrect, as the passage actually states the opposite: that measurements of position can be taken. The third choice is a correct inference because the passage states that quantum mechanics describes particles as waves and that quantum mechanics has been verified as true.
Answer: C
Explanation
The first statement is a proper inference because passage states that A particle trapped in a closed box has some finite probability of being at any location within the box, meaning the exact location of the particle cannot be known. You know from the next sentence that opening the box will locate the particle, and thus you can deduce that the location cannot be known for certain without observing the particle. The second statement is incorrect, as the passage actually states the opposite: that measurements of position can be taken. The third choice is a correct inference because the passage states that quantum mechanics describes particles as waves and that quantum mechanics has been verified as true.
Answer: C
