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The speed of light is the fastest in which medium
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The speed of light is the fastest in which medium

User Xmanoux
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Light waves do not need a medium in which to travel but sound waves do. Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water.
User Yati Sawhney
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In vacuum, going at 2.99×10^8 m/s.

User Fedvasu
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