• # question_answer The ratio of the frequencies of the long wavelength limits of the Lyman and Balmer series of hydrogen is: A) 27 : 5                 B) 5 : 27C)      4 : 1                  D) 1 : 4

$\lambda$ (longest) for balmer series$=(36/5R)$ $\lambda$ (longest) for Lyman series$=(4/3R)$ $\therefore$Read ratio $=\frac{4}{3}\times \frac{5}{36}=\frac{5}{27}$ Hence, the correction option is (b).