To Explain the Line Emission Spectra of Hydrogen in the Visible

Multiple Choice

To explain the line emission spectra of hydrogen in the visible region, Balmer proposed the following formula $\frac{1}{\lambda}=\mathrm{R}\left(\frac{1}{2^{2}}-\frac{1}{n^{2}}\right)$ . According to this formula, which of the following is the possible value for n?

A) 1
B) 2
C) 3
D) -1
E) -3