Q. The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number $Z$ of hydrogen like ion is
A) 2
B) 3
C) 4
D) 1
Explanation
(a) $\left( 1 - \frac{1}{4} \right) = Z^{2}\left\lbrack \frac{1}{4} - \frac{1}{16} \right\rbrack$
$\therefore Z = 2$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.