Use (7.113) and (5.8) to show that From (7.114) it follows that Use (7.113), (5.9), and (4.24)

Question:

Use (7.113) and (5.8) to show that

From (7.114) it follows that

Use (7.113), (5.9), and (4.24) to show that

If we consider a classical-mechanical particle, its wave function will be large only in a very small region corresponding to its position, and we may then drop the averages in (7.115) to obtain Newton's second law. Thus classical mechanics is a special case of quantum mechanics. Equation (7.115) is known as Ehrenfest's theorem, after the physicist who derived it in 1927.