Caclulate (I) is the wavelength and (ii) the frequeny of the `H_(beta)` line of the second line of Balmer series for some hydrogen.

Explanation

To solve the problem of calculating the wavelength and frequency of the H-beta line of the second line of the Balmer series for hydrogen, we will follow these steps:

### Step 1: Identify the Transition
The H-beta line corresponds to the transition from n=4 to n=2 in the Balmer series. The Balmer series includes transitions that end at n=2.

### Step 2: Use the Rydberg Formula
The Rydberg formula for hydrogen is given by:

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