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OpenStudy (anonymous):
Which statement is correct? Light can travel in a vacuum, and it travels faster if the light source is moving. Light can travel in a vacuum, and its speed is constant if the source is moving or stationary. Light can travel in a vacuum and will travel faster if the light source is moving. Light can travel in a vacuum, and it travels more slowly if the light source is stationary.
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OpenStudy (anonymous):
the second one. whether the source is moving or stationary, the speed remains the same.
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