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light pulse

Expert replies
by real2008 » Fri Oct 02, 2009 2:51 am
Scientists in Princeton have broken the speed barrier posed by light and caused a light pulse to travel at many times the speed of light.
A) and caused a light pulse to travel at many times the speed of light.
B) and have caused light pulse to travel at many times the speed of light.
C) and has caused a light pulse to travel at many times the speed of light.
D) and caused light pulses to travel at many times the speed of light.
E) and have enabled a light pulse to travel at many times the speed of light.

why [spoiler]A and not D?[/spoiler]
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Source: — Sentence Correction |

Re: light pulse

by riteshbindal » Fri Oct 02, 2009 10:50 pm
real2008 wrote:Scientists in Princeton have broken the speed barrier posed by light and caused a light pulse to travel at many times the speed of light.
A) and caused a light pulse to travel at many times the speed of light.
B) and have caused light pulse to travel at many times the speed of light.
C) and has caused a light pulse to travel at many times the speed of light.
D) and caused light pulses to travel at many times the speed of light.
E) and have enabled a light pulse to travel at many times the speed of light.

why [spoiler]A and not D?[/spoiler]
D is changing the meaning. As per original sentence, scientists have caused "one" (a) light pulse to travel but D says that scientists have caused light pulses. This is not the information given in original sentence. Hence D is incorrect
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