In the hydrogen atom spectrum, let $E_1$ and $E_2$ be the energies for the transitions $n=2 \rightarrow n=1$ and $n=3 \rightarrow n=2$ respectively. The ratio $E_2 / E_1$ is

  • A
    $\frac{2}{3}$
  • B
    $\frac{3}{2}$
  • C
    $\frac{2}{9}$
  • D
    $\frac{5}{27}$

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