Question

Explain why we can predict the arrival of a train by placing our ear on the rails without seeing it

Answer 1

Explaination is given below -

•Sound requires medium to travel because molecules of medium help in propagation of sound waves.

•Sound of arriving train can be heard better through railway tracks rather than air, because sound waves travel 15 times faster through the metal railway tracks in comparison to air.

•Thus arrival of train can be predicted better from railway tracks than air.