GKFix MCQ Question

What is the radius of the first Bohr orbit?

• A. 2.12 × 10⁻¹⁰ m
• B. 4.77 × 10⁻¹⁰ m
• C. 5.29 × 10⁻¹¹ m
• D. 6.54 × 10⁻¹¹ m