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JEE Main Chemistry question

ChemistryStructure of AtomJEE Main

Complying with Bohr atomic model, an electron from 6th excited state emits energy and comes to various lower energy states. The total number of spectral lines is 'a', out of which 'b' are visible lines. What is the value of ?

Answer: 19

Solution

Taking the electron's starting level as (as intended by the question's '6th excited state' count here), total spectral lines emitted on cascading down to are $ =

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Question ID VK-133024