Question

if u place your ear close to an iron railing which is tapped some distance away,you will hear the sound twice,can you explain why this happens?

Answer 1

If u place your ear close to an iron railing which is tapped some distance away,you will hear the sound twice. This happens because once you hear the sound propagated by the iron railing and other propagated by the air. Notably , the sound propagating through the railing would be heard first.