Question

When we put our ears on a railway track, we can hear an approaching train, but it’s
sound cannot be heard through air. Why?

Answer 1

Answer:

so…ry did not know if you mind so then i will search

Answer 2

Answer:

We can hear the sound of an approaching train by putting our ear to the railway line made of iron or steel even when the train is far away because the sound produced by the motion of train's wheels over the railway line is carried away quickly by the steel rails than in air