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Engineering Physics by S. Mani Naidu

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Solved Problems

1.     Find the temperature at which there is 1% probability that a state with energy 0.5 eV above Fermi energy.

 

(Set-1, Set-3, Set-4–May 2007), (Set-1, Set-2, Set-3–Sept. 2006), (Set-2, Set-3–May 2006), (Set-1, Set-4–June 2005), (Set-1–May 2003)

Sol: Probability, f(E)= 1% = 1/100

EEF = 0.5 eV

T = ?

images

Substituting the values, we get:

images

Taking ln on both sides, we get:

images

2.     Fermi energy of copper is 7 eV at room temperature. ...

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