Question

The ratio of minimum frequency of Lyman & Balmer series will be :

• A. $1.25$
• B. $0.25$
• C. $5.4$
• D. $10$

Answer 1

The correct option is C $5.4$

Lyman series minimum frequency line 2 $\to$ 3 transition

balmer series minimum frequency line 3 $\to$ 2 transition

In the ratio of energies of photons only differs in transition shells and other values are constant so we can neglect other values.

$\frac{\text{Lyman series minimum frequency line}}{\text{bamer series minimum frequency line}}=\frac{1/1-1/2^2}{1/2^2-1/3^2}$

$=\frac{3/4}{36/5}$

$=5.4$