When the wave of hydrogen atom comes from infinity into the first orbit then the value of wave number is
Answer & explanation
Correct answer: option 1
Wave number $\bar{v}=\frac{1}{\lambda}=R\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right] ; n_2=\infty$ and $n_1=1$
$\Rightarrow \bar{v}=R=1.097 \times 10^7 ~m^{-1}=109700 ~cm^{-1}$