Calculate wavelength for `2^(nd)` line of Balmer series of `He^(+)` ion

Explanation

To calculate the wavelength for the \(2^{nd}\) line of the Balmer series of the \(He^+\) ion, we can follow these steps:

### Step 1: Understand the Balmer Series
The Balmer series corresponds to transitions of electrons in a hydrogen-like atom where the final energy level \(n_1\) is 2. The transitions occur from higher energy levels \(n_2\) to \(n_1\).

### Step 2: Identify the Values of \(n_1\) and \(n_2\)
For the \(2^{nd}\) line of the Balmer series:
- \(n_1 = 2\) (final energy level)
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