Problem: In the top part of image below, the four lines in the H atom spectrum are due to transitions from a level for which ni &gt; 2 to the nf = 2 level. What is the value of ni for the red line in the spectrum?

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In the top part of image below, the four lines in the H atom spectrum are due to transitions from a level for which ni > 2 to the nf = 2 level. What is the value of ni for the red line in the spectrum?