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Q.

A potential barrier V volts exists across a P-N junction. The thickness of depletion region is ‘d’. An electron with velocity v approaches the junction from N-side. The velocity of the electron crossing the junction is

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a

$\sqrt{v^{2} + \frac{2 V e}{m}}$

b

$\sqrt{\frac{2 V e}{m}}$

c

$\sqrt{v^{2} - \frac{2 V e}{m}}$

d

$v$

answer is B.

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Detailed Solution

Electron looses energy as it goes along the

fields

$\frac{1}{2} m V_{1}^{2} = \frac{1}{2} m v^{2} - e V$

$∴ V^{1} = \sqrt{v^{2} - \frac{2 e V}{m}}$

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