The wave number of the first line in the balmer series of `Be^(3+)` ?

Explanation

To find the wave number of the first line in the Balmer series of \( \text{Be}^{3+} \), we can follow these steps:

### Step 1: Understand the relationship between wave number and atomic number
The wave number (\( \bar{\nu} \)) of spectral lines in hydrogen-like ions is given by the formula:
\[ \bar{\nu} \propto Z^2 \]
where \( Z \) is the atomic number of the ion.
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