Question:medium

An electron in n-region of a p-n junction moves towards the junction with a speed of \(5 \times 10^5\ \text{ms}^{-1}\). If the barrier potential of the junction is \(0.45\ \text{V}\), then the speed with which the electron enters the p-region after penetration through the barrier is
(Charge of the electron \(= 1.6 \times 10^{-19}\ \text{C}\) and mass of the electron \(= 9 \times 10^{-31}\ \text{kg}\))

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Remember that majority carriers (electrons in n-type) must climb an energy hill to cross the junction. Therefore, their kinetic energy decreases.

Updated On: Mar 26, 2026

\(3 \times 10^5\ \text{ms}^{-1}\)
\(5 \times 10^5\ \text{ms}^{-1}\)
\(4 \times 10^5\ \text{ms}^{-1}\)
\(6 \times 10^5\ \text{ms}^{-1}\)

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The Correct Option is A

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