SAT Prep

Category - Reading

Most elementary school students learn that matter exists in three different states: gas, liquid, and solid. The states of matter, as everyone knows, describe how the atomic particles interact with one another and the distances and attractions that govern those interactions

In 1995, a fourth form of matter was created by scientists working with ultra-cold atoms. This fourth form is called Bose-Einstein condensate. Long theorized as being a potential state of matter, Bose-Einstein condensate (BEC) consists of a cluster of atoms cooled to temperatures so close to absolute zero that they merge into a single quantum state. In a single quantum state, all of the particles can be described mathematically as a single unit. The distinctions between particles dissipate and the cluster functions, to a great extent, as a single unit.

Currently, the only use for BEC is for more research. Scientists are using BEC to simulate condensed matter systems, which are forms of matter in which the atoms or particles are highly concentrated. A potential application of BEC is in the development of quantum computers, which store and process information on subatomic particles. BEC is an attractive data storage solution because an infinite number of atoms can be merged into exactly the same quantum state, and would, therefore, allow for coherent transmission of information. Researchers have already had success creating BEC clouds of millions of atoms, an indication that, theoretically, the creation of large data storage clouds is feasible.



What is the most likely reason the author has included the opening paragraph of this passage?
  1. To remind readers of their prior knowledge of states of matter.
  2. To establish the importance of the discovery of BEC.
  3. To describe the key differences between gasses, liquids, solids, and BEC.
  4. To establish credibility as an authority on the subject of atomic particles.
Explanation
Answer: A - The author has included the opening paragraph of this passage to remind readers of their prior knowledge of states of matter. First the author lists the states of matter that are studied in elementary school science classes. Next, the author explains that the states of matter describe how atomic particles interact. The reader needs this information to understand how BEC is different from the other states.
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