Potential well solutions question

[physicsjock]

http://img138.imageshack.us/img138/7762/asdhl.jpg
Thanks in advance

 

[conquest]

Without really answering the question it might help you to think about two things:

1) what is d, if d=0 then you have the same answer!

2) if it had to do with passing through the barrier shouldn't the depth u be of interest as well? in the sense that there is no passing through an infinite barrier, but if u is not quantatively involved then passing to the limit u goes to infinity will not end you up in the case of the infinite well.