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  4. The number of spectral lines obtained in Bohr spectrum of hydrogen atom when an electron is excited from 2 textnd orbit to 5 textth orbit, is

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Q. The number of spectral lines obtained in Bohr spectrum of hydrogen atom when an electron is excited from $2^\text{nd}$ orbit to $5^\text{th}$ orbit, is

Structure of Atom

Solution:

Number of spectral lines from $n_1$ to $n_2$
$=\frac{\left(n_2-n_1+1\right)\left(n_2-n_1\right)}{2}$
$=\frac{(5-2+1)(5-2)}{2}=6$