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  4. Number of spectral lines of Lyman series of electron when it jumps from 6 to first level (in Lyman series), is

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Q. Number of spectral lines of Lyman series of electron when it jumps from $6$ to first level (in Lyman series), is

Punjab PMETPunjab PMET 2009

Solution:

Number of spectral lines $=\frac{n(n-1)}{2}$
$=\frac{6(6-1)}{2}$
$=15$