試題詳解

18. The potential energy function of a particle moving in one dimension is U=kx²e^−x2/a2where  a = 7.50nm . At what value of x is a point of stable equilibrium located?
(A) 6.81 nm
(B) 7.50 nm
(C) 7.80 nm
(D) 11.03 nm
(E) 12.62 nm