The radius of innermost orbit of hydrogen atom is 5.3 × 10⁻¹¹ m. What is the radius of third allowed orbit of hydrogen atom?
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The radius of innermost orbit of hydrogen atom is 5.3 × 10⁻¹¹ m. What is the radius of third allowed orbit of hydrogen atom?

G1 Physics · Accepted Answer

For hydrogen, rₙ = n²r₁. With n = 3, r₃ = 9(5.3 × 10⁻¹¹) m = 4.77 × 10⁻¹⁰ m = 4.77 Å. Answer: B.