Electronics and Communication Engineering - Exam Questions Papers - Discussion


The electric field of 2.5 x 107 V/m can give 1 eV energy to condition electron, then in a copper block what will be the mean free path of electron?

[A]. 5 x 10-8 m
[B]. 4 x 10-7 m
[C]. 0.4 m
[D]. 0.5 m

Answer: Option B


The force on electron in eE. As the electron moves through distance d , the work done on it is eEd.

This is equal to energy transferred to electron.

eEd = 1 eV

d = 4 x 10-7m.

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