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A potential barrier of \( 0.4 \mathrm{~V} \) exists across \( a p-n \) junction. An electron enters the junction from the \( n \)-side with a speed of \( 6.0 \times 10^{5} \mathrm{~ms}^{-1} \). The speed with which electron enters the p-side will be \( \frac{x}{3} \times 10^{5} \mathrm{~ms}^{-1} \) the value of \( x \) is
(Given mass of electron \( =9 \times 10^{-31} \mathrm{~kg} \), charge on electron \( =1.6 \times 10^{-19} \mathrm{C} \).)
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