Select the correct answer.Read paragraphs 12 through 14 from the passage.(12) Up to 50 times more stable than the atomic clocks on GPS satellites, NASA's Deep Space Atomic Clock is intended to be the most stable atomic clock ever flown in space. It achieves this stability by using mercury ions.(13) Ions are atoms that have a net electric charge, rather than being electrically neutral. In any atomic clock, the atoms are contained in a vacuum chamber, and in some of those clocks, atoms interact with the vacuum chamber walls. Environmental changes such as temperature will then cause similar changes in the atoms and lead to frequency errors. Many atomic clocks use neutral atoms, but because the mercury ions have an electric charge, they can be contained in an electromagnetic "trap" to prevent this interaction from happening, allowing the Deep Space Atomic Clock to achieve a new level of precision.(14) For missions going to distant destinations like Mars or other planets, such precision makes autonomous navigation possible with minimal communication to and from Earth — a huge improvement in how spacecraft are currently navigated.How does the information in paragraph 12 connect the information provided in paragraphs 13 and 14? A. by explaining the similarities and differences between mercury ions and electrically neutral atoms B. by explaining how scientists determined that NASA's Deep Space Atomic Clock is 50 times more stable than atomic clocks on GPS satellites C. by explaining the process navigators use to calculate a spacecraft's trajectory using communications to and from Earth D. by explaining how the use of mercury ions in the Deep Space Atomic Clock makes autonomous navigation possibleReset Next© 2024 Edmentum. All rights reserved.

Select the correct answer from the drop-down menu.Read paragraphs 11 and 12 from the passage.(11) Atomic clocks are used onboard GPS satellites that orbit the Earth, but even they must be sent updates two times per day to correct the clocks' natural drift. Those updates come from more stable atomic clocks on the ground that are large (often the size of a refrigerator) and not designed to survive the physical demands of going to space.(12) Up to 50 times more stable than the atomic clocks on GPS satellites, NASA's Deep Space Atomic Clock is intended to be the most stable atomic clock ever flown in space. It achieves this stability by using mercury ions.How does the detail about natural drift help refine the central idea of the passage?The detail about natural drift helps the reader to understand

Select the correct answer.Read paragraphs 1 and 2 from the passage.(1) Developed by NASA's Jet Propulsion Laboratory in Pasadena, California, the Deep Space Atomic Clock is a serious upgrade to the satellite-based atomic clocks that, for example, enable the GPS on your phone.(2) Ultimately, this new technology could make spacecraft navigation to distant locations like Mars more autonomous. But what is an atomic clock? How are they used in space navigation, and what makes the Deep Space Atomic Clock different? Read on to get all the answers.How does the author unfold the idea that the Deep Space Atomic Clock is a serious upgrade to satellite-based atomic clocks? A. The author follows up her claim by describing how the Deep Space Atomic Clock could make space travel better. B. The author presents a series of facts and makes an appeal to authority to convince readers of their accuracy. C. The author follows up her claim by asking a series of questions that readers will have to continue reading to get answered. D. The author compares the new technology to the old technology, delineating exactly what makes the new technology superior.

Select the correct answer from the drop-down menu.Read paragraphs 9 and 10.(9) By space navigation standards, quartz crystal clocks aren't very stable. After only an hour, even the best-performing quartz oscillators can be off by a nanosecond (one billionth of a second). After six weeks, they may be off by a full millisecond (one thousandth of a second), or a distance error of 185 miles (300 kilometers). That would have a huge impact on measuring the position of a fast-moving spacecraft.(10) Atomic clocks combine a quartz crystal oscillator with an ensemble of atoms to achieve greater stability. NASA's Deep Space Atomic Clock will be off by less than a nanosecond after four days and less than a microsecond (one millionth of a second) after 10 years. This is equivalent to being off by only one second every 10 million years.How does the author develop her point that atomic clocks are better than quartz crystal clocks for space navigation?The author develops her point by

What is the main assumption behind the idea of a molecular clock?Multiple choice question.A constant rate of evolution of a moleculeA constant radioactivity rate in fossilsThe presence of a stable molecule that does not change over timeA constant rate of breakdown of an unstable molecule over time

What is the main assumption behind the idea of a molecular clock?Multiple choice question.A constant radioactivity rate in fossilsThe presence of a stable molecule that does not change over timeA constant rate of evolution of a moleculeA constant rate of breakdown of an unstable molecule over time