when we put our ear to a railway line we can hear the sound of an approaching train even when thr train even when the train is far off but its sound cannot be heard through the air why?

Because track of train is a solid material and due to its density the sound can travels more faster than in air, so the sound heard while putting our ear on the track is greater.

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because sound tralves fastest in solids and slowest in gases.

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soundes  speed is great  in  solid>liquid>air

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Sound travels faster in solids than in air

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