A transverse pulse generated at the bottom of a uniform rope of length $L$, travels in upward direction. The time taken by it to travel the full length of rope will be
  • A$\sqrt{\frac{L}{2 g}}$
  • B$\sqrt{\frac{2 L}{g}}$
  • C$\sqrt{\frac{L}{g}}$
  • D$\sqrt{\frac{4 L}{g}}$
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