Propagation of electromagnetic wave

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jeevansai
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will the distance traveled by an em wave depends on temperature,if so then explain
 
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The EM waves travel with the speed of light.You know it is c in vacuum, but different from c in media, having different permittivity / refractive index. These material properties depend on the temperature, so the speed of light in a medium also depends on the temperature. If the speed is different, the distance traveled in the same time is also different.
 
The word "medium" means "material".