13. A particle in a finite potential well has energy E, as shown below.

The wave function in region I where x ＜ 0 has the form ψI =
(A) αe⁻ᵏˣ
(B) βeᵏˣ
(C) A sin(kx)
(D) B cos(kx)
(E) A sin kx + B cos kx

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