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# Comets do not give off their own light but reflect light

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Comets do not give off their own light but reflect light [#permalink]

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01 Jul 2004, 10:26
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Comets do not give off their own light but reflect light from other sources , such as the Sun.Scientists estimate the mass of comets by their brightness: the greater a comet's mass, the more light that comet will reflect. A satellite probe, however, has revealed that the material of which Halley's comet is composed reflects 60 times less light per unit mass than had been previously thought.

The statements above, is true, give the most support to which one of the following?

(A) Some comets are composed of material that reflects 60 times more light per unit of mass than the material of which Halley's comet is composed.

(B)Previous estimates of the mass of Halley's comet which were based on its brightness were too low.

(C) The total amount of light reflected from halley's comet is less than scientists had previously thought.

(D) The reflective properties of the material of which comets are composed vary considerably from comet to comet.

(E) Scientists need more information before they can make a good estimate of the mass of Halley's comet.

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Pls. support your choice with an explanation.
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01 Jul 2004, 10:32
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01 Jul 2004, 20:02
Sorry guys, I'll check the other posts before to make sure I don't duplicate.

Thanks cbrf3 for posting the link.
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01 Jul 2004, 21:12
shankarn wrote:
Comets do not give off their own light but reflect light from other sources , such as the Sun.Scientists estimate the mass of comets by their brightness: the greater a comet's mass, the more light that comet will reflect. A satellite probe, however, has revealed that the material of which Halley's comet is composed reflects 60 times less light per unit mass than had been previously thought.

(A) Some comets are composed of material that reflects 60 times more light per unit of mass than the material of which Halley's comet is composed.
Not necessary right, there is no comparison that could be drown by the argument between Halley's comet and other comets.

(B)Previous estimates of the mass of Halley's comet which were based on its brightness were too low.
It is the opposite, the estimate was higher then what had been revealed.

(C) The total amount of light reflected from Halley's comet is less than scientists had previously thought.
This is my choice because it could be implied by the bold part of the argument

(D) The reflective properties of the material of which comets are composed vary considerably from comet to comet.
Could not be supported by the argument above.

(E) Scientists need more information before they can make a good estimate of the mass of Halley's comet.
Why they have to do so? Not supported.

I hope this will help.
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01 Jul 2004, 21:18
oopps I haven't read all the post, but can some one explain why it is B . I think B states the contradict the argument.
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01 Jul 2004, 22:10
hi dr_sabr,

You could refer to the following link, where this Q was already posted and received clear explanations on why "B". Hope it helps.

http://www.gmatclub.com/phpbb/viewtopic.php?t=4939

FYI, the OA is also B.
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02 Jul 2004, 07:30
Thank you shankarn
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02 Jul 2004, 07:30
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