# The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is $\large\frac{16}{15 R}$$cm$. What is the value of $n_2 ?$ (R=Rydberg constant)

$\begin {array} {1 1} (a)\;2 & \quad (b)\;3 \\ (c)\;4 & \quad (d)\;1 \end {array}$

(c) 4