Calculate the wave number and wave length of `H_(beta)` line in the Balmer series of hydrogen emission spectrum.

Explanation

To calculate the wave number and wavelength of the H-beta line in the Balmer series of the hydrogen emission spectrum, we can follow these steps:

### Step 1: Identify the Transition
In the Balmer series, the H-beta line corresponds to the transition from n=4 to n=2. Here, n1 = 2 (final state) and n2 = 4 (initial state).

### Step 2: Use the Rydberg Formula
The wave number (ṽ) can be calculated using the Rydberg formula for hydrogen:
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