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Frequency is the function of density $\left(\rho \right)$, length (a) and surface tension (T). Then its value is

(1) $k{\rho }^{1/2}{a}^{3/2}\mathbf{/}\sqrt{T}$

(2) $k{\rho }^{3/2}{a}^{3/2}/\sqrt{T}$

(3) $k{\rho }^{1/2}{a}^{3/2}/{T}^{3/4}$

(4) $k{\rho }^{1/2}{a}^{1/2}/{T}^{3/2}$