Radio interferometry is a technique for studying details of : GMAT Critical Reasoning (CR)
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# Radio interferometry is a technique for studying details of

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02 Nov 2005, 13:08
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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.
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02 Nov 2005, 16:59
E seems to stand out for me. A, B, C, and D appear to be slightly off topic.
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02 Nov 2005, 17:09
imo- A

(A) Special care was taken in the launching of the satellite so that the calculations of its orbit would be facilitated. - This is the inference

(B) The signals received on the satellite are stronger than those received by a terrestrial telescope. - not mentioned
(C) The resolution of detail achieved by the satellite-Earth interferometer system is inferior to that achieved by exclusively terrestrial systems. - not mentioned
(D) The computer programs required for making use of the signals received by the satellite required a long time for development. - not mentioned
(E) The location of an orbiting satellite relative to locations on Earth can be well enough known for interferometric purposes. - Is stated in the passage.

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02 Nov 2005, 18:13
I vote for E.

A - Incorrect. Argument is not about launching telescopes.
B - Incorrect. Stronger/Weaker signals is out of scope.
C - Incorrect. There is not mention of quality of resolution.
D - Incorrect. Out of scope as argument does not talk about the development of computer programs.
E - Correct. The exact location of a telescope(ground/satellite based) must be known at all times for interferometric purposes as mentioned in the argument . Hence the answer.
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03 Nov 2005, 19:24
OA?
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03 Nov 2005, 22:14
a) Out of scope
b) Many people would pick this. Howeve, this cannot be inferred
c) Out of scope
d) Out of scope

E is the best answer. The relative locaitons of the Earth and satellite need to be known to ensure "successful interferometic linking of an Earth-base radio.... with a radio ... on an orbiting satellite."
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03 Nov 2005, 22:36
D for me

Nakib77, you got some nasty questions, keep bringing them
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04 Nov 2005, 01:12
E for me too
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04 Nov 2005, 03:27
nakib77 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.

The bold part indicates that the linkage was successful, thus what can be inferred here must be sth that describe how the success was achieved.
A seems ok but it doesn't state anything in between of a spaced R telescope with a terrestial one.
E seems best coz of its " interferometric purposes" .
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04 Nov 2005, 08:56
E.

All others seem irrelevant.
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04 Nov 2005, 21:03
OA is E. Good job.
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04 Nov 2005, 21:03
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