A potential barrier `V` volts exists across a `P-N` junction. The thickness of the depletion region is 'd'. An electron with velocity 'v' approches `P-N` junction from N-side. The velocity of the electron acrossing the junction is.

Options

A. `sqrt(v^(2)+(2Ve)/(m))`
B. `sqrt(v^(2)-(2Ve)/(m))`
C. `v`
D. `sqrt((2Ve)/(m))`

Answer

B

Explanation

`v^(2) -u^(2) = 2as`.