GKFix MCQ Question

What is the radius of the third Bohr orbit in a hydrogen atom?

• A. 3.21 × 10⁻¹⁰ m
• B. 4.77 × 10⁻¹⁰ m
• C. 6.33 × 10⁻¹⁰ m
• D. 7.89 × 10⁻¹⁰ m