The radius of inner most orbit of hydrogen atom is 5.3×10^-11 m. What is the radius of third allowed orbit of hydrogen atom?

1. \(4.77\,\mathring{A}\)

2. \(0.53\,\mathring{A}\)

3. \(1.06\,\mathring{A}\)

4. \(1.59\,\mathring{A}\)

Doubtly Asked 30 Oct 2026 NEET UG 2023 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. \(4.77\,\mathring{A}\)

Bohr orbit radius: \(r_n=n^2 r_1\).

Third orbit: \(r_3=9\times5.3\times10^{-11}=4.77\times10^{-10}\) m = 4.77 Å (1 Å = \(10^{-10}\) m).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?