Question

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is:

Options

• 1

• 4

• 0.5

• 2

Answer 1

4

Explanation:

In case of Balmer series:

\[n_{1}=\infty,\quad n_{2}=2\Rightarrow\lambda_{1}=\frac{4}{R}\]

In case of Lyman series:

\[n_{1}=\infty,n_{2}=1\Rightarrow\lambda_{2}=\frac{1}{R}\]

Now λ₁/λ₂ = 4