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प्रश्न
The mean free path of electrons in a metal is 4 x 10-8m. Find the electric field, in units of V/m, which can give on an average 2 eV energy to an electron in the metal.
उत्तर
Electric field, E = `"V"/"d" = 2/(4 xx 10^-8) = 5 xx 10^7` V/m
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