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Answer :
Final answer:
The correct answer is that b. sound travels faster through the rail than the air, primarily due to the higher density and rigidity of steel rails compared to air.
Explanation:
The sound of an approaching train can be heard through the rail before it can be heard through the air because sound travels faster through the rail than through the air. This is due to the fact that solids, like rails made of iron or steel, tend to support sound waves better than gases such as air, because solid materials have a greater density and a higher degree of rigidity.
In the context of the question, option b) that sound travels faster through the rail than through the air is the correct answer. This is not only because of greater density but more significantly due to the higher rigidity of the material. Steel rails, being more rigid and dense compared to air, enable sound waves to propagate more efficiently and at greater speeds.
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