when the train is far off but its sound cannot be heard through air. Why

Discussion in 'CBSE Class 9 Physics Help' started by Vinila Choudary, Mar 23, 2012.

  1. Vinila Choudary

    Vinila Choudary Active Member

    When we put our ear to a railway track, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through air. Why?

    Sound travels about IS times faster in iron (or steel) than in air So, sound travels much faster through the railway track made of steel than through air. That is why, we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through air.

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