• # question_answer Which of the following transition have minimum wavelength? A) ${{n}_{4}}\to {{n}_{1}}$                              B) ${{n}_{2}}\to {{n}_{1}}$ C) ${{n}_{4}}\to {{n}_{2}}$                              D) ${{n}_{3}}\to {{n}_{1}}$

$E=\frac{hc}{\lambda }orE\propto \frac{1}{\lambda }$ Thus, a decrease in wavelength represents an increase in energy for ${{n}_{4}}\to {{n}_{1}}$ transition. Greater the energy difference will follow lower wavelength.  Thus, for ${{n}_{4}}\to {{n}_{1}}$ transition, wavelength would be minimum.