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A sperical ball of mass m, radiua r is c...

A sperical ball of mass m, radiua r is connected to string of length `(l gt gt r)`. This string is then connected to fixed point and this arrangement allowed to oscillate in a medium whose density is `rho` and viscosity is `eta`. If amplitude of oscillation becomes half of the initial value after n seconds then viscosity of liquid is given by (Assume that resistance force on ball follows stoke's law)

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