SudiptoGmat wrote:
Radio interferometry is a technique for studying details of celestial objects that combines signals intercepted by widely spaced radio telescopes. This technique requires ultraprecise timing, exact knowledge of the locations of the telescopes, and sophisticated computer programs. The successful interferometric linking of an Earth-based radio telescope with a radio telescope on an orbiting satellite was therefore a significant technological accomplishment.
Which of the following can be correctly inferred from the statements above?
(A) Special care was taken in the launching of the satellite so that the calculations of its orbit would be facilitated.
(B) The signals received on the satellite are stronger than those received by a terrestrial telescope.
(C) The resolution of detail achieved by the satellite-Earth interferometer system is inferior to that achieved by exclusively terrestrial systems.
(D) The computer programs required for making use of the signals received by the satellite required a long time for development.
(E) The location of an orbiting satellite relative to locations on Earth can be well enough known for interferometric purposes.
panshul22:
RI combines signals from various telescopes to study celestial objects.
It requires ultraprecise timing,
exact knowledge of the locations of the telescopes, and sophisticated computer programs (It is a complicated technique)
Earth based telescope was successfully interferometrically linked with a satellite telescope.
Conclusion - This is a significant tech achievement.
We need to find what can be inferred i.e. as per the passage, what must be true. The correct option should give us no new information.
(A) Special care was taken in the launching of the satellite so that the calculations of its orbit would be facilitated.
We don't know whether special care was taken while launching to ease calculations or whether the computer programmer had to work extra hard to calculate its orbit while linking with terrestrial location.
(B) The signals received on the satellite are stronger than those received by a terrestrial telescope.
We don't know. Nothing says that signals on the satellite are stronger.
(C) The resolution of detail achieved by the satellite-Earth interferometer system is inferior to that achieved by exclusively terrestrial systems.
Again, we don't know.
(D) The computer programs required for making use of the signals received by the satellite required a long time for development.
Again, we don't know. They may have taken a short time but involved complex algorithms.
(E) The location of an orbiting satellite relative to locations on Earth can be well enough known for interferometric purposes.
Correct. We know that satellite telescope has been successfully interferometrically linked with terrestrial telescope. That means we could calculate location enough for our purpose (otherwise linking would not have been successful as per the highlighted portion above).
Answer (E)