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The Rydberg constant $R$ for hydrogen is

• A
  $R=-\left(\frac{1}{4 \pi \varepsilon_0}\right) \cdot \frac{2 \pi^2 m e^2}{c h^2}$
• B
  $R=\left(\frac{1}{4 \pi \varepsilon_0}\right) \cdot \frac{2 \pi^2 m e^4}{c h^2}$
• C
  $R=\left(\frac{1}{4 \pi \varepsilon_0}\right)^2 \cdot \frac{2 \pi^2 m e^4}{c^2 h^2}$
• ✓
  $R=\left(\frac{1}{4 \pi \varepsilon_0}\right)^2 \cdot \frac{2 \pi^2 m e^4}{c h^3}$