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# Spectroscopic analysis has revelaed the existence of frozen

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Manager
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Spectroscopic analysis has revelaed the existence of frozen [#permalink]

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24 Jul 2004, 08:28
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Spectroscopic analysis has revelaed the existence of frozen nitrogen, methane and carbon monoxide on the surface of Pluto. Such ices have a tendency to vaporize, producing an atmosphere. Since the proportion of any gas in such an atmosphere depends directly on how readily the corresponding ice vaporizes, astronomers have concluded that the components of Pluto's atmosphere are nitrogen, carbon monoxide and methane, in order of decreasing abundance.

The astronomer's argument relies on which one of the following assumptions?

(A) There is no more frozen nitrogen on the surface of Pluto than there is either frozen carbon monoxide or methane

(B) Until space probes reash Pluto, direct analysis of the atmosphere is impossible.

(C) There is no frozen substance on the surface of Pluto that vaporizes more readily than methane but less readily than carbon monoxide

(D) Nitrogen is found in the atmosphere of a planet only if nitrogen ice is found on the surface of that planet

(E) A mixture of nitrogen, carbon monoxide and methane is characteristic of the substances from which the Solar System formed.

Please tell why you choose partcular option and why you eliminate others ..OA will follow ...
Director
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24 Jul 2004, 09:45
C would be the best answer..

The conclusion is that '....nitrogen, carbon monoxide and methane, in order of decreasing abundance'. Meaning there is more Methane than CO than Nitrogen.or M>CO>N in pluto's atmosphere.

The evidence states that the pluto's surface has Nitrogen, CO and Methane.

So the assumption is Methane vaporize faster than CO than N. Which is what is in C.

What is the OA.
Manager
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24 Jul 2004, 12:50
I'd go with D

The author tells us thta the three gases are prsent in frozen form on Pluto's surface and hence the atmosphere shall contain these three gases. The author (perhaps) assumes that no other gase can be present in Pluto's atmosphere.

This has been brought out well in D
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Not absurd

Director
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Re: CR: Spectroscopic analysis of Pluto [#permalink]

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24 Jul 2004, 16:20
2 mins

I will go with A on this one.
Scientists are basing their judgement on the atmosphere of Pluto based on the chemical (read: vaporizing) properties of N2, CO, Methane. i.e.e CO vaporizes faster than N2 and hence CO will be present more in the atmosphere than N2.
But what if we have only x amt of CO ice and 1000X amt of N2?
Then there will be an imbalance in the ratio of N2 and CO in atmosphere
Hence the author must be assuming that amt of N2:CO:Methane ice is same
Manager
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26 Jul 2004, 08:26
OA is C
26 Jul 2004, 08:26
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