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Particles that move under the influence of step potential with energy E<Vo can still penetrate the embankment with a maximum penetration
distance of x=1/a which is called skin depth.
a. Derive the skin depth equation
b. Calculate the skin depth of an electron (me= 9.1 x 10-31) with an energy of 3 eV trying to penetrate a step potential that is 5 eV high.

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