Hydrogen (H), deuterium (4), singly ionized helium (\[H{{e}^{+}}\] and doubly ionized lithium (Li) all have one electroi around the nucleus. Consider n = 2 to n = 1 transition the wavelengths of emitted radiations are \[{{\lambda }_{1}},\]\[{{\lambda }_{2}},\]\[{{\lambda }_{3}},\] and \[{{\lambda }_{4}}\] respectively. Then approximately

• A. \[{{\lambda }_{1}}={{\lambda }_{2}}=4{{\lambda }_{3}}=9{{\lambda }_{4}}\]
• B. \[4{{\lambda }_{1}}=2{{\lambda }_{2}}=2{{\lambda }_{3}}={{\lambda }_{4}}\]
• C. \[{{\lambda }_{1}}=2{{\lambda }_{2}}=2\sqrt{2}{{\lambda }_{3}}=3\sqrt{2}{{\lambda }_{4}}\]
• D. \[{{\lambda }_{1}}={{\lambda }_{2}}=2{{\lambda }_{3}}=3\sqrt{2}{{\lambda }_{4}}\]