(5-17)  ①  Use the wonder of calculus to find an expression for  <r> at any turning point in the graph.

②  Use the data below to find the value of <r> at the turning point.

                   e = 1.602 x 10-19 C                                ε0 =  8.85 x 10-12 C2N-1m-2

electron mass = 9.109 x 10-31 kg              constant, h = 6.626 x 10-34 m2kgs-1

③  Verify that this is, indeed, a minimum in the energy function.