In a p - n junction, an electric field of 5 × 10 5 V m exists in the depletion region. The minimum kinetic energy of a conduction electron, in order to diffuse from n -side to the p -side, is found to be 3 . 2 × 10 - 20 J . The width of the depletion region is,

Question

In a p - n junction, an electric field of 5 × 10 5 V m exists in the depletion region. The minimum kinetic energy of a conduction electron, in order to diffuse from n -side to the p -side, is found to be 3 . 2 × 10 - 20 J . The width of the depletion region is,, 2 × 10 - 4 cm, 8 × 10 - 5 cm, 5 × 10 - 6 cm, 4 × 10 - 5 cm

MARKS App · Accepted Answer

The kinetic energy in terms of electric potential, K . E . = e V , it means the value of electric potential, V = K . E . e = 3 . 2 × 10 - 20 1 . 6 × 10 - 19 , now the relation between electric field strength and electric potential in terms of the width of the depletion region, d = V E = 3 . 2 × 10 - 20 1 . 6 × 10 - 19 5 × 10 5 = 4 × 10 - 5 cm .

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