As per Bohr model of a hydrogen atom for a stable orbit centripetal, Coulomb, and all forces should be in equilibrium. Therefore, for an electron with mass me and speed v₁ on the nth orbit with radius rn, (k being Coulomb/s constant) mevn = ke²/rn 2 mevn² = ke²/rn mevn²/rn = ke²/rn me²v₁² = ke²/r₂²
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