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hmk4 solutions - EEE 352 Homework 4 2.26 Consider the...

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Unformatted text preview: EEE 352 Homework 4 2.26 Consider the particle in the infinite potential well as shown in Fig. 2.11. Derive and sketch the wave functions corresponding to the four lowest energy levels (use Nanohub.org to plot these functions). Using Nanohub.org, we select the standard values of all parameters except the well depth, which we set to 5 eV (in order to have more than 4 energy levels). Then, the wave functions are: 1 2 3 4 2.32 Evaluate the transmission coefficient for an electron of energy 2.2 eV impinging upon a potential barrier of 6.0 eV and thickness 10-10 m. Repeat the calculation for a barrier thickness of 10-9 m. Assume that equation (2.62) is valid. From the notes, we have T = 1 1 + k 1 2 + 2 2 k 1 2 sinh 2 ( a ) = 1 1 + V 2 4 E ( V E ) sinh 2 ( a ) . We evaluate the decay constant as Hence, for 0.1 nm thickness, we have T = 1 + 6 2 4 2.2 3.8 sinh 2 ( 9.975 10 9 10 10 ) 1 = 0.404 For 1 nm thickness, this becomes...
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This note was uploaded on 09/28/2009 for the course EEE 352/333 taught by Professor Allee during the Fall '09 term at ASU.

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hmk4 solutions - EEE 352 Homework 4 2.26 Consider the...

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