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The radius of the second Bohr orbit for the hydrogen atom is :(Plank's const. h = 6.6262 × 10–34 Js ; mass of electron = 9.1091 × 10–31 kg ; charge of electrone = 1.60210 × 10–19 C ; permittivity of vacuum∈0 = 8.854185 × 10–12 kg–1 m–3 A2)
1.65Å
4.76Å
0.529Å
2.12Å
