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In astronomy the term red shift denotes the extent to which

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In astronomy the term red shift denotes the extent to which [#permalink]

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New post 10 Aug 2008, 21:53
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In astronomy the term “red shift” denotes the extent to which 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.
(A) to which light from a distant galaxy has been shifted
(B) to which light from a distant galaxy has shifted
(C) that light from a distant galaxy has been shifted
(D) of light from a distant galaxy shifting
(E) of the shift of light from a distant galaxy

Guys pls explain why is should be Has been instead of has???

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Re: SC -Astronomy [#permalink]

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New post 10 Aug 2008, 22:07
vivektripathi wrote:
In astronomy the term “red shift” denotes the extent to which 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.
(A) to which light from a distant galaxy has been shifted
(B) to which light from a distant galaxy has shifted
(C) that light from a distant galaxy has been shifted
(D) of light from a distant galaxy shifting
(E) of the shift of light from a distant galaxy

Guys pls explain why is should be Has been instead of has???


IMO A)

"has been" is required because it is shifted by another factor not by its own.

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Re: SC -Astronomy [#permalink]

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New post 10 Aug 2008, 22:32
vivektripathi wrote:
In astronomy the term “red shift” denotes the extent to which 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.
(A) to which light from a distant galaxy has been shifted
(B) to which light from a distant galaxy has shifted
(C) that light from a distant galaxy has been shifted
(D) of light from a distant galaxy shifting
(E) of the shift of light from a distant galaxy

Guys pls explain why is should be Has been instead of has???


A. B changes meaning. In A, Light is shifting where as in B Light shfted someting that is not mentioned.
A, eventhough it is in passsive form, remains
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Re: SC -Astronomy [#permalink]

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New post 11 Aug 2008, 00:27
vivektripathi wrote:
In astronomy the term “red shift” denotes the extent to which 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.
(A) to which light from a distant galaxy has been shifted
(B) to which light from a distant galaxy has shifted
(C) that light from a distant galaxy has been shifted
(D) of light from a distant galaxy shifting
(E) of the shift of light from a distant galaxy

Guys pls explain why is should be Has been instead of has???

this question is discussed many times!!
IMO A
here funda is read the sentence ,lookfor a clue : light is shifted by by the rapid motion of galaxy ..... hence we need a passive !!
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Re: SC -Astronomy [#permalink]

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New post 11 Aug 2008, 01:16
the voice is passive: light from a distant galaxy has been shifted toward the end of the light spectrum by the rapid motion.

Here the rapid motion has shifted the light. Not that the light has shifted itself. So we should use passive voice.

So, B, D and E are out

Between A, C
Extent to … is the correct idiom

My ans is A

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Re: SC -Astronomy   [#permalink] 11 Aug 2008, 01:16
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In astronomy the term red shift denotes the extent to which

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