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Comets do not give off their own light but reflect light [#permalink]
16 Jul 2005, 14:14
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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 cometâ€™s mass, the more light that comet will reflect. A satellite probe, however, has revealed that the material of which Halleyâ€™s comet is composed reflects 60 times less light per unit of mass than had previously thought
The statements above, if 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 Halleyâ€™s comet is composed
B)Previous estimates of the mass of Halleyâ€™s comet which based on its brightness were too low
C)The total amount of light reflected from Halleyâ€™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 Halleyâ€™s comet
then I realize C is obvious...but is wrong, scientist knew how much light it emitted, however the passage say that the composites of comet Haley reflects less light than they had previously speculated...B says that the mass estimates maybe off..
you need to limit opening too many threads so fast. please stop posting any new questions. let all these threads be resolved.
I agree with you. I also think it would be better to impose a limit on the number of new posts (i mean original posts) per section, if possible. Particularly Verbal and Math sections should be given proper attention to avoid excessive posts. This kind of control help discuss the posts properly and have the OA on time.