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A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the ropes. A transverse pulse of wavelength λ 1, is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ2. The ratio 
λ21 is 

(a)√m1+m2/m2 (b)√m2/m1  (c)√m1+m2/m1    (d)√m1/m2