Question

Total number of lines in Lyman series of $H$ hydrogen spectrum will be (where $n=$ number of orbits) :

• A. $n$
• B. $n-1$
• C. $n-2$
• D. $n(n+1)$

Answer 1

The correct option is B $n-1$

The spectrum of hydrogen has many spectral lines. These lines are formed due to electronic transitions. All the wavelengths in the Lyman series are in the ultraviolet band. If n' is the lowest energy level then $n^{\prime }=1$ for Lyman series. The number of lines in n orbit for Lyman series is $=n-1$.