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प्रश्न
Explain why you can predict the arrival of a train by placing your ear on the rails without seeing it.
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उत्तर
The sound produced by the moving wheels of train travels much faster through the track than through the air. Therefore they hear through the track much before it is heard through the – air.
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संबंधित प्रश्न
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Can sound travel through vacuum?
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(b) having a fixed volume but no fixed shape?
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