$S_1:$ Bohr model is applicable for $B{e}^{\mathit{+}\mathit{2}}$ ion.

$S_2:$ Total energy coming out of any light source is an integral multiple of the energy of one photon.

$S_3:$ Number of waves present in unit length is wave number.

$S_4:$  $\mathrm{e}/\mathrm{m}$ ratio in a cathode ray experiment is independent of the nature of the gas.

Select the correct set of True-False for above statement.