光在真空中传播速度为             m/s,光在其他透明物质中

光在真空中传播速度为             m/s,光在其他透明物质中传播的速度比在真空中传播的速度要________电闪雷鸣时,我们总是先看到闪电后听到雷声,说明光速比声速      (填).

答案

 3×108         

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