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A rod hanging from ceiling has linear de...

A rod hanging from ceiling has linear density given as `lambda=m_0(1+x)` kg/m, where `m_0` is constant and x is distance of a point from free end . if the length of the rod is 4m then velocity of wave at x=1m is

A

`sqrt(12g/5) m/s`

B

`sqrt(3g/4) m/s`

C

`sqrt(15g/8) m/s`

D

`sqrt(4g/3) m/s`

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