Determine the expectation value of r for the electron of an excited hydrogen atom if it...

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In quantum mechanics, the expectation value of a mechanical quantity is given by where AÌ is the operator for the mechanical quantity and Ï is the wave function for the state of the...
An excited hydrogen atom with an electron in the n = 5 state emits light having a frequency of 6.90 1014 s-1. Determine the principal quantum level for the final state in this electronic transition.
An excited hydrogen atom could, in principle, have a radius of 1.00mm. What would be the value of n for a Bohr orbit of this size? What would its energy be?
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