Question

The shortest wavelength of the Paschen series of a hydrogen like atom (atomic number = Z) is the same as the shortest wavelength of the Lyman series of hydrogen atom. The value of Z

• A. 2
• B. 3
• C. 4
• D. 5

Answer 1

Answer: (B)

3

Answer 2

$\frac{1}{\lambda}$= RZ² $\left( \frac{1}{3^{2}} - \frac{1}{\infty} \right)$ = $R.1^{2}\left( \frac{1}{1^{2}} - \frac{1}{\infty} \right)$

Ž Z = 3