A student, having seen the termination condition , argues: “Since is just and added…

PHYSICS · Multi-part · Fermi University Physics · Quantum Mechanics · Atomic, Molecular & Optical Physics · One-electron atoms and the origins of atomic structure

Quantum Mechanics: From the Photon to the Hydrogen Atom, Ch The hydrogen atom

Problem

A student, having seen the termination condition n=nr+l+1n = n_r + l + 1, argues: “Since nn is just nrn_r and ll added together, the number of radial nodes nrn_r must be the same for every state at a given nn, namely nr=n−1n_r = n-1, taking l=0l=0 as the baseline.” Test the claim for the hydrogen level n=4n=4, using the eigenvalue relation ∣L∣=l(l+1) ℏ|\mathbf L| = \sqrt{l(l+1)}\,\hbar of Chapter 10. ((a)) List the values of ll allowed at n=4n=4, and the value of nrn_r each one requires. ((b)) Does every n=4n=4 state have the same number of radial nodes? Answer the claim directly. ((c)) Give ∣L∣|\mathbf L|, as a multiple of ℏ\hbar to three significant figures, for the n=4n=4 state with the most radial nodes, and for the one with the fewest.

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