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# In astronomy the term "red shift" denotes the extent to which light fr

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Intern
Joined: 21 Aug 2011
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GMAT Date: 04-02-2012
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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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05 Apr 2012, 22:54
A but the moving galaxy is "doing" the shifting of the light. Thus, Has Been is the correct usage.
Manager
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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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13 Nov 2012, 08:42
has been shifted means the shifting has been done by somebody or something.

whereas has shifted means that a change has already occurred.

So i choose B as the shifting was done by something.
Intern
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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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07 Feb 2013, 09:55
Rarely the Passive voice is preferred over Active voice, this is a perfect example.

The Passive voice is required when the non- underlined portion of the sentence contains the person or agent performing the action preceded by the word "by".
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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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08 Nov 2013, 06:52

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.

Now see B

In astronomy the term "red shift" denotes the extent to which light from a distant galaxy has shifted
by the rapid motion of the galaxy away from the Earth.

Has shifted by is incorrect.

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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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17 Nov 2013, 08:56
Hi,

- Basic question:

I know than we need "from...to". But can we say "from... toward" also?

Thanks
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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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14 Mar 2017, 08:47
Hi sayantanc2k

Please can you explain why "has been" is required here ?

Thanks!
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Joined: 14 Mar 2011
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Re: In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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16 Mar 2017, 05:55
hotshot02 wrote:
Please can you explain why "has been" is required here ?

Thanks!

Because, we need passive structure here - "light" cannot do the action of "shifting" them self towards another end of the light spectrum. In addition, "by the rapid motion" in the non underline portion intensifies the need for passive structure, hence "has been".

Hope this helps !!
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In astronomy the term "red shift" denotes the extent to which light fr [#permalink]

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16 Mar 2017, 05:55
This topic have been merged with: http://gmatclub.com/forum/topic-45682.html
In astronomy the term "red shift" denotes the extent to which light fr   [#permalink] 16 Mar 2017, 05:55

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