(a) Prove the following: a i. (p'lxla) = in (p'la), ap ii. (Blxla) = / dp'43(p')ih ap Pa( P'), where da(p') = (p'la) and de(p ) = (p'|B) are momentum-space wave func- tions. (b) What is the physical significance of ixE exp h where x is the position operator and E is some number with the dimension of momentum? Justify your