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  4. Hydrogen atom excites energy level from fundamental state to n=3. Number of spectrum lines, according to Bohr, is

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Q. Hydrogen atom excites energy level from fundamental state to $n=3$. Number of spectrum lines, according to Bohr, is

Atoms

Solution:

Number of spectral lines $=\frac{n(n-1)}{2}$
$=\frac{3(3-1)}{2}=3$