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Mechanical Properties of Fluids
Question
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If an observer places his ear at the end of a long pipe, he can hear two distinct sounds when pipe is hammered at the other end. Why?

Answer

Sound propagates both through solid pipe as well as in air, when the pipe is hammered.
The velocity of sound in solids is greater than air. Therefore, sound through solid pipe will reach earlier than sound through air. Hence a person hears two distinct sounds. 

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Some More Questions From Mechanical Properties of Fluids Chapter

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Define frequency.