4. What is the expectation value of momentum squared ⟨p²⟩ for a particle described by the normalized wavefunction Ψ(x,t) = , where E is a real constant and a ＞ 0, in the position space? (Hint: dxe^-αx²= for α ＞ 0)
(A)
(B) iℏ
(C)
(D)
(E)

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