Solution

• k={8?2m(U0-E)/h2}1/2

• ={8(3.14)2(9.11x10-31)(6.8eV-5.1eV)1.6x10-19/(6.63x10-34)2}1/2

• = 6.67x109 m-1

• 2kL = 2(6.67x109 m-1)(750x10-12 m) =10.

• T = e-2kL = e-10 = 45x10-6

• how would this change for a proton?

• m is larger by a factor of 2000 => k larger by ~45

• T ~ e-186

• what about a baseball? => zero!

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