Q. When the wave of hydrogen atom comes from infinity into the first orbit then the value of wave number is
A) $109700\ cm^{- 1}$
B) $1097\ cm^{- 1}$
C) $109\ cm^{- 1}$
D) None of these
Explanation
(a) Wave number $\overline{v} = \frac{1}{\lambda} = R\left\lbrack \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right\rbrack;n_{2} = \infty$ and $n_{1} = 1$
$\Rightarrow \overline{v} = R = 1.097 \times 10^{7}m^{- 1} = 109700\ cm^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.