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

User Martin Massera
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13 votes
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 Boio
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13 votes

In vacuum, going at 2.99×10^8 m/s.

User Otrejni
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