Let \(\hat x\) and \({\rm{\hat p}}\) denote position and momentum operators obeying the commutation relation \(\left[ {{\rm{\hat x,}}\,{\rm{\hat p}}} \right]\) = ih. If |x〉 denotes an eigenstate of \({{\rm{\hat x}}}\) corresponding to the eigenvalue x, then \({{\rm{e}}^{{\rm{ia\hat p/h}}}}\left| x \right\rangle \) is
1
an eigenstate of \(\hat x\) corresponding to the eigenvalue x
2
an eigenstate of \(\hat x\) corresponding to the eigenvalue (x + a)
3
an eigenstate of \(\hat x\) corresponding to the eigenvalue (x − a)
4
not an eigenstate of \(\hat x\)