(Answered) 1 what is the minimum potential difference that must be

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1. What is the minimum potential difference that must be applied to an Xray tube to knock a K shell electron completerly out of an atom in a copper (Z=29) target. Use bohr model as needed.

2. AN electron is in the n=5 state. What is the smallest possible value for the angle between the z component of the orbital angular momentum and the orbital angular momentum?

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