# Complex conjugate of the expectation value of momentum

jb646

## Homework Statement

Compute the complex conjugate of <p> using eq 1.35 (<p>=∫ψ*(h/i)∂/∂x ψ dx) and prove that <p> is real (<p>=<p>*)

## Homework Equations

equation 1.35 is given above

## The Attempt at a Solution

to take the c.c. dont i just add a minus to the i and switch the stars like so:
<p>=∫ψ(-h/i)∂/∂x ψ* dx
i think that is right, but it seems too simple for what i should be doing. as for the second part, could somebody please nudge me in the right direction.

thanks for all your help.

## Answers and Replies

Science Advisor
Homework Helper
Well, now comes the tricky part, shifting the derivative under the integral back to the psi. This is done only under the assumption that the wavefunction is normalized to unity.

Can you do it now ?