Show that [3.57]Hint: Notice that x exp(ipx/h) = —ih(d/dp)exp(ipx/h).In momentum space, th...

Show that

 [3.57]

Hint: Notice that x exp(ipx/h) = —ih(d/dp)exp(ipx/h).

In momentum space, then, the position operator is iћ∂/∂p. More generally,

 [3.58]

In principle you can do all calculations in momentum space just as well (though not always aseasily) as in position space.