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29 Jul 2020, 16:45
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imSKR
Hello, imSKR. I am a little confused by your post. To be sure, extend is a verb, but the extent mentioned in the sentence at hand is, in fact, a noun. The next part of your post reads like a dictionary entry, but no source is cited. I agree that that may follow extent, but I would expect to see a to hanging around in front of extent that, and (C) lacks that keyword. I am hard-pressed to figure out a way to cram a correct to the extent that into the shell of the sentence, but it is a non-issue anyway, since we are not able to insert words willy-nilly into the non-underlined part of the sentence.
1) In astronomy the term “red shift” denotes the extent... toward the red, or long-wave, end of the light spectrum by the rapid motion of the galaxy away from the Earth.
For extent that... to be correct, we would need a different sentence altogether.
2) In astronomy the term "red shift" denotes that light from a distant galaxy has been shifted to the extent that it appears toward the red, or long-wave, end of the light spectrum by the rapid motion of the galaxy away from the Earth.
Of course, GMAC™ has created the original sentence and four other choices to test a specific point, so you have to work with what is on the screen. (C), as written, is missing a vital piece of the extent that construct that would allow it to operate, so we can safely eliminate it.
I hope that helps. Thank you for thinking to ask me about this difficult question.
- Andrew
29 Jul 2020, 19:27
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MentorTutoring
Thanks Andrew for explanation. I have correct my typo ( extend--extent ( noun)- apologies for such a silly typo.
Can i take away the following points :
1. "shift" can not be literally denote "extent" as shift is a qualitative change and extent is a degree of that change.
so we must need a preposition with extent to express the clear meaning
Thus, extent will come before or after a preposition( to , of ), C option is more of idiomatic type.
2. is the below version also correct?
In astronomy the term "red shift" denotes to the extent that light from a distant galaxy has been shifted toward the red, or long-wave, end of the light spectrum by the rapid motion of the galaxy away from the Earth.
29 Jul 2020, 21:23
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imSKR
Hi imSKR,
Even if we had a to there, to the extent that carries a very different meaning. Let's first check what the sentence wants to say.
"red shift denotes the extent to which light has been shifted toward the red end of the light spectrum by the rapid motion of the galaxy away from the Earth"
Here, we can read "the extent to which" as ~"how much". That is, "red shift denotes ~how much it (light) has been shifted toward the red end of the spectrum". So maybe the light from one galaxy appears closer to red than light from another galaxy does.
In this case, "to the extent that" is closer to ~"so much". For example (active, skipping some words):
The light shifted, but not to the extent that it appeared red. ← This means that light "shifted", but it did not shift so much that it actually appeared red.
The light shifted to the extent that it appeared red. ← This is not correct. It means that the light actually appeared red. The sentence says only that light is shifted toward red. All the way to red would be only a subset of what the sentence is trying to say.
