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Sushant Naruka
Asked: 2022-11-11T08:35:27+05:30 In:

In a `p-n` junction the depletion region is `400 nm` wide and electric field of `5 xx 10^(5) Vm^(-1)` exists in it. The minimum energy of a conduction electron, which can diffuse from n-side to the p-side is.
A. `4 eV`
B. `5 eV`
C. `0.4 eV`
D. `0.2 eV`

In a `p-n` junction the depletion region is `400 nm` wide and electric field of `5 xx 10^(5) Vm^(-1)` exists in it. The minimum energy of a conduction electron, which can diffuse from n-side to the p-side is.
A. `4 eV`
B. `5 eV`
C. `0.4 eV`
D. `0.2 eV`
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  1. Correct Answer – D
    `W = Vq = Edq`
    `= 5 xx 10^(5) xx 400 xx 10^(-9) xx 1.6 xx 10^(-19) J`
    `= (5 xx 10^(5) xx 400 xx 10^(-9) xx 1.6 xx 10^(-19)J)/(1.6 xx 10^(-19))eV`
    `= 2000 X 10^(-4) eV = 0.2 eV`.

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