Question
An approaching train can be felt by applying ears onto rails but not easily through air. Why?
Solution
The density of a medium affects the loudness of sound. More the medium is denser, more is the intensity and hence more is the loudness of the sound.
Therefore, sound of distant train travelling through rails is louder than air. So, approaching train can be felt by applying ears onto rails but not easily through air.
Therefore, sound of distant train travelling through rails is louder than air. So, approaching train can be felt by applying ears onto rails but not easily through air.
