Introduction To Quantum Mechanics
3rd Edition
ISBN: 9781107189638
Author: Griffiths, David J., Schroeter, Darrell F.
Publisher: Cambridge University Press
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Question
Chapter 7, Problem 7.42P
(a)
To determine
Obtain an expression for
(b)
To determine
Obtain an expression for
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Consider a cubic 3D infinite well.
part a: How many different wave functions have the same energy as the one for which (n_x, n_y, n_z) = (5,1,1)? How much of this degeneracy is due to symmetry and how much is “accidental”?
4.7. Let y(x, t) be the wave function of a spinless particle corresponding to a plane
wave in three dimensions. Show that (x.-) is the wave function for the plane
wave with the momentum direction reversed.
b. Let x(n) be the two-component eigenspinor of an with eigenvalue +1. Using
the explicit form of x(A) (in terms of the polar and azimuthal angles ß and y that
characterize A) verify that -io₂x() is the two-component eigenspinor with the
spin direction reversed.
8.8 Calculate by direct integration the expectation values (r) and (1/r) of the radial position for
the ground state of hydrogen. Compare your results to the quoted expressions in Eq. (8.89)
and discuss your results. Did you expect that (1/r) # 1/(r)? Use your result for (1/r) to
find the expectation value of the kinetic energy of the ground state of hydrogen and discuss
your result.
8.9 Calculate by direct integration the expectation value of the radial position for each of the
Chapter 7 Solutions
Introduction To Quantum Mechanics
Ch. 7.1 - Prob. 7.1PCh. 7.1 - Prob. 7.2PCh. 7.1 - Prob. 7.3PCh. 7.1 - Prob. 7.4PCh. 7.1 - Prob. 7.5PCh. 7.1 - Prob. 7.6PCh. 7.2 - Prob. 7.8PCh. 7.2 - Prob. 7.9PCh. 7.2 - Prob. 7.10PCh. 7.2 - Prob. 7.11P
Ch. 7.2 - Prob. 7.12PCh. 7.2 - Prob. 7.13PCh. 7.3 - Prob. 7.15PCh. 7.3 - Prob. 7.16PCh. 7.3 - Prob. 7.17PCh. 7.3 - Prob. 7.18PCh. 7.3 - Prob. 7.19PCh. 7.3 - Prob. 7.20PCh. 7.3 - Prob. 7.21PCh. 7.3 - Prob. 7.22PCh. 7.4 - Prob. 7.23PCh. 7.4 - Prob. 7.24PCh. 7.4 - Prob. 7.25PCh. 7.4 - Prob. 7.26PCh. 7.4 - Prob. 7.27PCh. 7.4 - Prob. 7.28PCh. 7.4 - Prob. 7.29PCh. 7.5 - Prob. 7.31PCh. 7.5 - Prob. 7.32PCh. 7 - Prob. 7.33PCh. 7 - Prob. 7.34PCh. 7 - Prob. 7.35PCh. 7 - Prob. 7.36PCh. 7 - Prob. 7.37PCh. 7 - Prob. 7.38PCh. 7 - Prob. 7.39PCh. 7 - Prob. 7.40PCh. 7 - Prob. 7.42PCh. 7 - Prob. 7.43PCh. 7 - Prob. 7.44PCh. 7 - Prob. 7.45PCh. 7 - Prob. 7.46PCh. 7 - Prob. 7.47PCh. 7 - Prob. 7.49PCh. 7 - Prob. 7.50PCh. 7 - Prob. 7.51PCh. 7 - Prob. 7.52PCh. 7 - Prob. 7.54PCh. 7 - Prob. 7.56PCh. 7 - Prob. 7.57P
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