A uniform rope of length L and mass m 1 hangs vertically from a rigid support. A block of mass m 2 is attached to the free end of the rope. A transverse pulse of wavelength 1 is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is 2 . The ratio 2/ 1 is :

1. A. m 1 m 2
2. B. m 1+m 2 m 2
3. C. m 2 m 1
4. D. m 1+m 2 m 1

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