GKFix MCQ Question

In the equation E = -e²/(8πε₀r), if the energy E is -13.6 eV, what is the approximate value of r?

• A. 5.3 x 10⁻¹¹ m
• B. 1.0 x 10⁻¹⁰ m
• C. 2.7 x 10⁻¹¹ m
• D. 1.2 x 10⁻¹⁰ m