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A free particle of energy E moving in one dimension is incident on an attractive potential well of width 2a = f/(2mE)2. Find the

A free particle of energy E moving in one dimension is incident on an attractive potential well of width 2a = f/(2mE)2. Find the phase shift of the wavefunction (a) when -U-El; (b) when -- U=31E. Discuss the physical consequences of case (b).

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