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Updated on: 05 Sep 2014, 21:48
Originally posted by itzmyzone911 on 05 Sep 2014, 00:26.
Last edited by itzmyzone911 on 05 Sep 2014, 21:48, edited 1 time in total.
Last edited by itzmyzone911 on 05 Sep 2014, 21:48, edited 1 time in total.
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
46% (02:58) correct
54%
(02:55)
wrong
based on 406
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History
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Not Attempted Yet
Science journalist: Brown dwarfs are celestial objects with more mass than planets but less mass than stars. They are identified by their mass and whether or not lithium is present in their atmospheres. Stars at least as massive as the Sun have lithium remaining in their atmospheres because the mixing of elements in their internal nuclear furnaces is incomplete. Stars with less mass than the Sun have no lithium because the element has been fully mixed into their nuclear furnaces and consumed. A brown dwarf does not have a fully functional nuclear furnace and so its lithium cannot be consumed.
Which one of the following is most is most strongly suppported by the science journalist's statements?
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.
B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.
C. No celestial object that has no lithium in its atmosphere is a brown dwarf.
D. No celestial object with lithium in its atmosphere has less mass than the Sun.
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.
I liked this question! Guys give it a try! OA later..
Which one of the following is most is most strongly suppported by the science journalist's statements?
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.
B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.
C. No celestial object that has no lithium in its atmosphere is a brown dwarf.
D. No celestial object with lithium in its atmosphere has less mass than the Sun.
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.
I liked this question! Guys give it a try! OA later..
05 Sep 2014, 01:55
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Science journalist: Brown dwarfs are celestial objects with more mass than planets but less mass than stars.
They are identified by their mass and whether or not lithium is present in their atmospheres.
Stars at least as massive as the Sun have lithium remaining in their atmospheres because the mixing of elements in their internal nuclear furnaces is incomplete.
Stars with less mass than the Sun have no lithium because the element has been fully mixed into their nuclear furnaces and consumed.
A brown dwarf does not have a fully functional nuclear furnace and so its lithium cannot be consumed.
Which one of the following is most is most strongly suppported by the science journalist's statements?
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun. [arg here is limited to stars]
B. Any celestial object with lithium in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.[we know this only abt star not other CO]
C. No celestial object that has no lithium in its atmosphere is a brown dwarf. [look at the bold stmt]
D. No celestial object with lithium in its atmosphere has less mass than the Sun.[we only abt star]
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.[planets r those CO but dont know abt the theor lthm composition.]
They are identified by their mass and whether or not lithium is present in their atmospheres.
Stars at least as massive as the Sun have lithium remaining in their atmospheres because the mixing of elements in their internal nuclear furnaces is incomplete.
Stars with less mass than the Sun have no lithium because the element has been fully mixed into their nuclear furnaces and consumed.
A brown dwarf does not have a fully functional nuclear furnace and so its lithium cannot be consumed.
Which one of the following is most is most strongly suppported by the science journalist's statements?
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun. [arg here is limited to stars]
B. Any celestial object with lithium in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.[we know this only abt star not other CO]
C. No celestial object that has no lithium in its atmosphere is a brown dwarf. [look at the bold stmt]
D. No celestial object with lithium in its atmosphere has less mass than the Sun.[we only abt star]
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.[planets r those CO but dont know abt the theor lthm composition.]
General Discussion
05 Sep 2014, 00:54
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i picked C : No celestial object that has no lithium in its atmosphere is a brown dwarf.
faults:
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.--->cannot be sure. we are told that stars having less mass than stars have no lithium .from this we cannot conclude that "Any celestial object without lithium in its atmosphere is a star " . it can be a planet !!
B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.---------->directly contradicts the premise W.D has no such reactor
C. No celestial object that has no lithium in its atmosphere is a brown dwarf.---->correct . B.D must have lithium !!
D. No celestial object with lithium in its atmosphere has less mass than the Sun.----->directly contradicts the premise. these B.D are refuting it
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.---->planet can have lithium and yet they can have less mass !!
faults:
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.--->cannot be sure. we are told that stars having less mass than stars have no lithium .from this we cannot conclude that "Any celestial object without lithium in its atmosphere is a star " . it can be a planet !!
B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.---------->directly contradicts the premise W.D has no such reactor
C. No celestial object that has no lithium in its atmosphere is a brown dwarf.---->correct . B.D must have lithium !!
D. No celestial object with lithium in its atmosphere has less mass than the Sun.----->directly contradicts the premise. these B.D are refuting it
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.---->planet can have lithium and yet they can have less mass !!
