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# The first spectral line in the Pfund series of Hydrogen spectrum is given by $(R_H$ = Rydberg constant )

$\begin {array} {1 1} (1)\;\large\frac{56\: R_H}{36} & \quad (2)\;\large\frac{7\: R_H}{144} \\ (3)\;\large\frac{11\: R_H}{900} & \quad (4)\;\large\frac{9\: R_H}{400} \end {array}$

(3) $\large\frac{11\: R_H}{900}$