The moment we put our ear to the railway line, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air. Why?
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Railway line is a solid and sound travels faster in solid than the liquid or air so on putting ear to the railway line sound can be hear but sound travels slower in air so it is heard after a bit more time.
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Explanation:But by putting our ear to the railway line, we can hear the sound of the coming train even if it is quite far away. This is Because sound waves travel very fast in Solids, Their speed is around 5100m/s , sound travels 15 times faster in steel than in air.
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