Question

why we put our ears to a railway track we can hear the sound of an approacng train even when the train is far off but sound can not be heard through air, Why?

Answer 1

It is because sound travels more faster in solid than air and water so railway tracks are maid of iron thus we heard the sound

hope this helps :-)

Answer 2

When we put our ear to a railway track, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through air. Why?

Sound travels about IS times faster in iron (or steel) than in air So, sound travels much faster through the railway track made of steel than through air. That is why, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through air.