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When a steel pipe is hammered at one end...

When a steel pipe is hammered at one end, we hear two sounds at another end. Why ?

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Because here one sound propagates in the solid medium of wall of pipe and another aound propagates in the air medium in the holow part of pipe with different speeds. Hence, we can hear them separately.
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KUMAR PRAKASHAN-WAVES-SECTION-C (Objective Questions (VSQs))
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