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One end of a metal pipe of length 660m i...

One end of a metal pipe of length 660m is struck a blow a listener at the other end hears two sounds at an interval of 1.89 seconds. The density of steel is `8xx10^(3)` `kg``/m^(3)` and the velocity of sound in air is 330m/s. Find the modulus of elasticity of the steel
(A) `1.88xx10^(11)N//m^(2)`
(B) `7.68xx10^(11)N//m^(2)`
(C) `2.88xx10^(11)N//m^(2)`
(D) `5.88xx10^(11)N//m^(2)`

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