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by mandeepak » Fri Oct 26, 2007 7:26 pm
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

When should we use has been ....
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by jangojess » Fri Oct 26, 2007 8:39 pm
has been shifted is used when some external factors attributed to that shift.....

eg: The cargo has been shifted by the labourers...here he cargo cant shift by itself...so an external factor - labourer is introduced to do the shifting.

has shifted is used when something is shifting by itself. No external factor plays a role in the shifting.

eg: John has shifted his residence from Florida to California.

Coming to our case...if you see in the last part of he sentence - by the rapid motion of the galaxy away from the Earth - this indicates an external factor introduced......So A is the right choice...
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by Danielle » Sat Nov 03, 2007 7:25 am
Great explanation on this one jangojess!
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by ranji » Sat Nov 03, 2007 1:57 pm
is the usage 'extent of' wrong?

if extent of is right, then E can be rite?

thoughts?
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by Danielle » Sat Nov 03, 2007 3:09 pm
Ranji, there are lots of times when you can say 'extent of' -- i.e., What is the extent of the damage? -- but this is a separate case where it doesn't work.

E is wrong because it changes the meaning of the sentence. The way E reads the red shift is the shift of light from a distant galaxy towards red...etc, but "from a distant galaxy" is simply being used to described the type of light, not where the light is shifting from. That's a usage change.

I hope that was clear!
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by ranji » Sun Nov 04, 2007 7:59 am
makes sense! thanks!
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by ranji » Sun Nov 04, 2007 8:07 am
makes sense! thanks!
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