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In a hydrogen spectum if electron moves ...

In a hydrogen spectum if electron moves from `6^(th)` to `2^(nd)` by transition in multi steps then find out the number of lines in spectum

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Total number of line `=4+3+2+1+0=10`
Total number of lines `=((n_(2)-n_(1))[(n_(2)-n_(1)+1)])/(2) = ((6-2)(4+1))/(2) implies (4xx5)/(2) = 10`
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