Q. The shortest wavelength which can be obtained in hydrogen spectrum is ($R = 10^{7}\ m^{- 1}$)
A) $1000\ \mathring{\mathrm{A}}$
B) $800\ \mathring{\mathrm{A}}$
C) $1300\ \mathring{\mathrm{A}}$
D) $2100\ \mathring{\mathrm{A}}$
Explanation
(a) For minimum wavelength $n_{2}\ = \infty\ ,\ n_{1} = n.$
So, $\lambda_{\min}$ = $\frac{n^{2}}{R}$ = $\frac{1}{10^{7}}$ = 1000 $\mathring{\mathrm{A}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.