20101ee2_1_HW2

# 20101ee2_1_HW2 - Physics for Electrical Engineers Prof B...

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Physics for Electrical Engineers Prof. B. Jalali EE 2 Homework #2 Due: Feb 02, 2010 Please turn in your homework in class. 1. (a) Calculate the Fermi energy (in units of eV) in the metallic state of silver. Density = 10.5 g/cm 3 , atomic weight = 108. Assume 1 electron per atom. (b) Calculate the average speed and average energy of the electrons at T=0K. 2. (a) Show that the Fermi function is symmetric about E F , i.e., f ( E F + Δ E )=1 - f ( E F - Δ E ) (b) Show that when ( E - E F ) 2 kT , f ( E ) exp E E kT F . Actually, calculate f ( E ) for ( E - E F ) equal to 2
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