Concept explainers
To Explain: Themethod of putting ear to a railway track to get an early warning of an approaching train.
Explanation of Solution
Introduction:
In different kinds of medium, sound travels with different speed.
For propagation,sound needs a medium. The speed of sound in a medium depends upon its densityandelasticity.
As per density and elasticity of medium, sound’s speed is largest in solids, lesser in liquids and least in gases.
The railways tracks are made of iron (solid).
Speed of sound in iron is faster(
Conclusion:
Thus, because sound travels faster in iron than in air, putting the ear to the railway track provides an early warning of the approaching train.
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