The effect of the spring mass can be accounted for to calculate the natural frequency of a springmass system by adding \(n\) times the mass of spring to the main mass, where

(a) \(n=\frac{1}{2}\)

(b) \(n=\frac{1}{3}\)

(c) \(n=\frac{1}{4}\)

(d) \(n=\frac{3}{4}\).