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If a person places his ear to one end of a long iron pipeline, he can distinctly hear two sound waves

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If a person places his ear to one end of a long iron pipeline, he can distinctly hear two sound waves when a workman hammers the other end of the pipeline. How?

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Sound waves travel sixteen times faster in iron than in air. Hence the person hears two sounds, the first one travelling through the iron pipeline and the second travelling through air.

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