p40_053.pdf

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Chapter 40 - 40.53
the Bohr radius. (See Eq. 40-31.) We want to evaluate the integral 0 P ( r ) dr . Eq. 15 in the integral
table of Appendix E is an integral of this form. We set n = 2 and replace a in the given formula with
2 /a and x with r .Then
a 3
0
4
a 3
2
(2 /a ) 3 =1 .
P ( r ) dr =
r 2 e 2 r/a dr =
0
53. The radial probability function for the ground state of hydrogen is P ( r )=(4 r 2 /a 3 ) e 2 r/a ,where a is
4
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