Why can you hear a train approaching when you put your ear on the railway track?

Question

Why can you hear a train approaching when you put your ear on the railway track? — Exam MCQ

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B. Sound travels efficiently through solid steel rails to your ear — The correct choice is Sound travels efficiently through solid steel rails to your ear. Sound behaviour is determined by wave properties such as frequency, amplitude, wavelength and the medium of propagation.

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A. Sound moves through the air above the track

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C. Rails vibrate more loudly than air does

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D. Vibrations travel only along the surface of the rails

Why can you hear a train approaching when you put your ear on the railway track?

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