The shortest wavelength in the Lyman series of hydrogen spectrum is 912 Å corresponding to a photon energy of 13.6 eV. The shortest wavelength in the Balmer series is about

3648 Å

In Lyman series $\left(\lambda_{\min }\right)_L=\frac{1}{R}$ and $\left(\lambda_{\min }\right)_B=\frac{4}{R}$

$\Rightarrow\left(\lambda_{\min }\right)_B=4 \times\left(\lambda_{\min }\right)_L=4 \times 912$ = 3648 Å