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Derive (4.l8a) in a semi classical way by assuming that the centripetal force of an electron, m2 /r, is counterbalanced by the Columbic attraction force

902_6f841040-7510-4102-9d8b-2986aacd0963.png between the nucleus and the orbiting electron. Use Bohr postulate which states that the angular momentum L = mr ( = linear electron velocity and r = radius of the orbiting electron) is a multiple integer of Planck constant (i.e., n . h)

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