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  1. 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?

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

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    Answer : Option B

    Explanation :

    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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