Energy needed to tunnel through a potential barrier

[Tester_Boy]

Homework Statement

An electron approaches a potential barrier 10 eV high and 0.5 nm wide. If the electron has a
1% chance of tunnelling through, what must be its energy?

Homework Equations

don't know how to put equations in eg how do i get something like alpha and theta etc

The Attempt at a Solution

ended up with a massive equations with E's all over the place and imposible to solve :(

 

[chrisk]

Show how you tried to solve this problem. What is the transmission coefficient expression you are using?