First slide

Bohr Model of the Hydrogen atom.

Question

Ratio of minimum frequency of lymann series to the maximum frequency of Balmer series is

Moderate

A

2:3
B

9:5
C

3:1
D

8:3

Solution

$ν \propto (\frac{1}{n_{f}^{2}} - \frac{1}{n_{i}^{2}})$
$∴ \frac{ν_{\min}}{ν_{\max}} = \frac{(1 - \frac{1}{2^{2}})}{(\frac{1}{2^{2}} - \frac{1}{\infty})} = \frac{3}{4} \times 4 = 3$

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