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A potential barrier of 0.5V exists across a p-n junction. An electron with speed $5 \times 10^{6} m / s$ approaches the p-n junction from the n-side, with what speed will it enter the p-side?

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2.7×105m/s

5.4×105m/s

5×106m/s

5×105m/s

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detailed solution

Correct option is A

As the electron crosses the potential barrier, its speed decreases.Using Conservation of Mechanical Energy, ⇒12mVi2 =eV+12mVf2⇒12(9.1×10-31)(5×106)2 =(0.5×1.6×10-19)+12(9.1×10-31)Vf2⇒Vf=2.7×105m/s

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A potential barrier of 0.5V exists across a p-n junction. An electron with speed 5×106m/s approaches the p-n junction from the n-side, with what speed will it enter the p-side?

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A potential barrier of 0.5V exists across a p-n junction. An electron with speed $5 \times 10^{6} m / s$ approaches the p-n junction from the n-side, with what speed will it enter the p-side?