Solving Quantum Physics Problem: Tunneling Probability and Electron Detection"

Ming0407
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An electron with kinetic energy E=2.0eV, is incident on a potential barrier with V0=6.5eV and
width 0.5nm. What is the possibility of the electron tunneling through the barrier? If a pulse of 1 million such electrons incident on the same barrier, how many electrons can be detected in the other side of the barrier?

How to find the possibility?

Can someone tell me what formulas to use?
 
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