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A. Light waves travel at a speed of about 300,000,000 m/s in empty space.
- Light travels as waves. These are transverse waves, like the ripples in a tank of water. The direction of vibration in the waves is at 90° to the direction that the light travels. Light travels in straight lines.
- The light waves that you see are traveling straight at you. The two polarizations, or directions that the light vibrates in, are then up and down and left and right. Natural light contains roughly equal amounts of each polarization.
- No water, no waves. Because light consists of photons, however, it can travel through space like a stream of tiny particles.
- The photons actually travel more quickly through space and lose less energy on the way, because there are no molecules in the way to slow them down.
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