CHAPTER 8A Problem Solving Flashcards

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[8A.2] Describe the features of the solution of the particle in a one-dimensional box that appear in the solutions of the particle in two- and three-dimensional boxes. What concept applies to the latter but not to a one-dimensional box.

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[8A.1(b)] Determine the linear momentum and kinetic energy of a free proton described by the wavefunction e^−ikx with k=5nm−1.

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[8A.3(b)] Calculate the energy separations in joules, kilojoules per mole, electronvolts, and reciprocal centimetres between the levels (i) n = 3 and n = 1, (ii) n = 7 and n = 6 of an electron in a box of length 1.50 nm.

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[8.4(b)] Calculate the probability that a particle will be found between 0.65L and 0.67L in a box of length L when it has (i) n = 1, (ii) n = 2. Take the wavefunction to be a constant in this range.

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surprised to find degeneracy in a box with unequal lengths. Symmetry is a matter of degree.
This box is less symmetric than a square box, but it is more symmetric than boxes whose
sides have a non-integer or irrational ratio. Every state of a square box except those with
n1=n2 is degenerate (with the state that has n1 and n2 reversed). Only a few states in this box
are degenerate. In this system, a state (n1, n2) is degenerate with a state (n2/2, 2n1) as long as
the latter state (a) exists (i.e., n2/2 must be an integer) and (b) is distinct from (n1, n2). A box
with incommensurable sides, say, L and 21/2L, would have no degenerate levels.

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