Answer
In a finite well, the de Broglie wavelength is greater than it would be if the potential well were infinite.
Work Step by Step
In a finite well, the matter wave leaks into the walls of the well. However, in an infinite well, the matter wave is restricted by the walls of the well.
Therefore, in a finite well, the de Broglie wavelength is greater than it would be if the potential well were infinite.
