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

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

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New post 07 Feb 2013, 08:55
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  [#permalink]

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New post 14 Mar 2017, 07:47
Hi sayantanc2k

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

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

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New post 16 Mar 2017, 04:55
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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Re: In astronomy the term "red shift" denotes the extent to which light  [#permalink]

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New post 10 Sep 2018, 17:33
nusmavrik wrote:
Cut the fluff, the statement reduces to :

(A) light has been shifted.... by the rapid motion of the galaxy

This means that "light" doesnt have a intent to shift on its own. The reason why it shifted is because of the change in wavelength caused by rapid motion of the galaxy [Doppler's effect] rapid motion of the galaxy causing the wavelength to shift to the red end of the spectrum

(B) to which light from a distant galaxy has shifted ---> change of meaning. It means that light shifted on its own irrespective of the "rapid motion" of galaxy.

Gotcha ! Ohh light shifted on its own and Doppler's theory is bull ****. Christian Doppler are you listening to this???? LOL

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noboru wrote:
could anybody elaborate a bit more?
thanks.

sometimes gmac brutally dishonor the real world conditions in exchange of getting that formate that it is accustomed to. This is my last standardized test I won't allow another test again to spoil my creative brain.
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Re: In astronomy the term "red shift" denotes the extent to which light  [#permalink]

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New post 12 Sep 2018, 14:18
I chose A as the 'by' in the non-underlined part hinted for passive but can someone explain why is E incorrect?
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Re: In astronomy the term "red shift" denotes the extent to which light  [#permalink]

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New post 13 Sep 2018, 04:23
Hi Ishita,

Option A: light from a distant galaxy has been shifted
- Notice that light is from the galaxy.

Option E: shift of light from a distant galaxy
- This could be interpreted as if light has been shifted away from the galaxy.

So, E changes the meaning of the original sentence.
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Re: In astronomy the term "red shift" denotes the extent to which light &nbs [#permalink] 13 Sep 2018, 04:23

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