Structure of Atom

Structure of Atom

Question

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 electron
e = 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

Answer

D.

2.12Å

Radius of nth Bohr orbit in H-atom = 0.53 n2Å
Radius of II Bohr orbit = 0.53 ×(2)2 = 2.12 Å

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