Quantum Tunneling from Bent Circular Wire

[Ichigo449]

Homework Statement

The electron enters a straight pipe of circular cross section (radius r). The tube is bent at a radius R≫r by the angle α and then is aligned back again. Find the probability that the electron will jump out

Homework Equations

Tunneling probability in WKB approximation.

The Attempt at a Solution

Unsure of what the potential should be and the effect that the bend has.

 

[mfb]

If that is the full problem statement, it looks odd. You'll have to add many assumptions to get a result.

 

[Ichigo449]

I thought it was very odd, and given the sparsity of information it seemed incalculable.. But, yes that is the entire problem statement. It comes from http://physics.stackexchange.com/questions/13861/lev-landaus-theoretical-minimum, the first response. Along with two other odd questions.
Thanks for your response.

 

[mfb]

I guess that is a very short version - it gives an idea of the problem, but it doesn't have the actual numbers necessary to solve it. Same with the other two problems.