Monnohramatic radition of wavelength `lambda` is incident on a hydrogen sample in ground state hydrogen atoms obserb a frection of light and subsequently and radition of six different wavelength .Find the value of `lambda`

Explanation

To solve the problem step by step, we will follow the reasoning provided in the video transcript.

### Step 1: Determine the number of spectral lines
Given that the hydrogen atoms absorb monochromatic radiation and subsequently emit radiation of six different wavelengths, we can use the formula for the number of spectral lines produced by transitions between energy levels:

\[ \text{Number of lines} = \frac{n(n-1)}{2} \]
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