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If you clap on one end of a long steel pipe you will hear two distinct sounds on the other end of the pipe. Explain.

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Solution

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The speed of sound in any medium is given by Sir Newton as ,
$v = \sqrt{E / ρ}$
where E= coefficient of elasticity of medium ,
ρ= density of medium ,
as solids are most elastic and gases are least elastic i.e. $E_{s} > E_{l} > E_{g}$ ,
therefore speed of sound in solids is maximum and in gases is minimum i.e. $v_{s} > v_{l} > v_{g}$ .
Here we have two media for the sound to travel and in these two media sound has different speed , as steel is a solid, sound travels faster through steel than through air , so sound through steel reaches before through air and we hear two sounds of clap on the other end .

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