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Re: Materials scientists have observed that, at cryogenic temperatures [#permalink]
taskforce wrote:
For question 3:
I think that the answer should be C rather than D.
Here is my explanation: They explain a quality that metals possess in natural conditions. they have constructed artificial cold and then they talk about how the metals that were conductive at the normal or the natural temps didn't translate to super conductors. This does not explain the a characteristics of the metals at the normal temperature because at the normal temperature the current is due to the free electrons and at the cryogenic the current is more due to the lattice to continuously synchronize its spacing with the passage of electrons through the structure.
Whereas in C it says that it refute a hypothesis about how metals will rank as superconductors. This is appropriate because in the previous passage they have given that Edoardo and Wouters posited, however, that this ordering would not bear out based on their calculations showing a finite capacity for electron flow through any material, even factoring in electron pairing. There should be more than electron pairing but the electron pairing explanation is the current hypo so it refutes it. Also The number of free electrons was a less important factor than the ability of the crystal lattice to continuously synchronize its spacing with the passage of electrons through the structure.


Here's how I would look at it. The sentence has to be viewed in the context of the sentence before it and the one after it.

The sentence before it introduces the lattice structure of a metal, which is an intrinsic property metals have in natural conditions. The sentence after it states how the lattice property is more important than the number of free electrons in generating the conductive properties observed at cryogenic temperatures. In essence, what we need is a sentence that provides an explanation to bridge the gap between the introduction of the property and the assertion of its relevance.

Just my 2c.

Cheers!
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Re: Materials scientists have observed that, at cryogenic temperatures [#permalink]
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