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Q & A: Does light stand still?

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Most recent answer: 10/22/2007
Q:
Hello Please tell me, is there an instant where light is standing still. Thanks
- Tshepo Ntsala (age 27)
South Africa. Soweto
A:
A beam of light in a vacuum will have the same velocity as measured by an observer in any frame. So no, we will never see light stand still.
James

Perhaps you heard about some recent experiments in which it was said that light trapped in a special material 'stood still' until it was released by another light beam. You could also describe the same experiments by saying that the material stored a sort of pattern guiding the release of the next light pulse, instead of saying that light itself stood still.

Mike

(published on 10/22/2007)

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