A rope of length $L$ and mass $M$ hangs freely from the ceiling. If the time taken by a transverse wave to travel from the bottom to the top of the rope is $T$, then time to cover first half length is

  • A

    $T$

  • B

    $T\left(\frac{\sqrt{2}-1}{\sqrt{2}}\right)$

  • C

    $\frac{T}{\sqrt{2}}$

  • D

    $\frac{T}{2}$

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  • [IIT 2013]

A uniform rope of mass $6\,kg$ hangs vertically from a rigid support. A block of mass $2\,kg$ is attached to the free end of the rope. A transverse pulse of wavelength $0.06\,m$ is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top is (in $m$ )