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An approaching train can be felt by appl...

An approaching train can be felt by applying ears to rails but through air its approach cannot felt easily Discuss.

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Intensity of sound is directly proportional to the density of the medium. Thus, sound travelling through rails (of larger density than that of air) is louder than the sound through air. Moreso, sound travels faster through the rails (solid medium) tan through the air (gaseous medium).
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