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OpenStudy (anonymous):

helloooo.......Which statement about how light travels is true? Light waves can travel in a vacuum and travel at a constant speed even if the light source is moving. Light waves need a medium to travel, and they travel at the same speed even if the light source is moving. Light waves can travel in a vacuum and will travel faster if the light source is moving forward. Light waves need a medium to travel, and they travel faster if the light source is moving forward

OpenStudy (anonymous):

First one. In vacuüm light moves at a speed of 3E8 m/s. It can't move faster in any circumstance. It doesn't need a medium to travel.

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