The radius of the first Bohr orbit of a hydrogen atom is 5.29 × 10⁻¹¹ m. What is the radius of the second Bohr orbit?
r₂ = 4 × r₁ = 2.116×10⁻¹⁰ m.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Atomic Models - Thomson Rutherford and Bohr Model