The correct statement is: Light waves travel faster in solids than in air.
In general, light waves travel fastest in a vacuum, then in air, followed by liquids, and slowest in solids due to the denser medium interacting with the light waves. However, the refractive index of a material determines the speed of light in that medium, and typically light does travel faster in solids compared to air because the density and elasticity of solids can allow for faster wave propagation under certain conditions.
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