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A potential barrier of 0.5V exists acros...

A potential barrier of 0.5V exists across a p-n junction and width of the depletion region is `0.5mum`. An electron with speed `5 xx 10^(5) m//s` enters p-side from n-side. The velocity of electron in p-side will be `(m_(e)=9.1 xx 10^(-31) kg, e=1.6 xx 10^(-19)C)`

A

`5 xx 10^(5) m//s`

B

`2.7 xx 10^(5)m//s`

C

`2.5 xx 10^(5) m//s`

D

`3.7 xx 10^(5) m//s`

Text Solution

Verified by Experts

The correct Answer is:
B
From energy conservation `eV=1/2 mv_(1)^2 -1/2mv_(2)^2`
`or 1/2 mv_2^2=1/2 mv_1^2-eV`
`or 1/2 xx 9.1 xx 10^(-31) xx v_2^2`
`=1/2 xx 9.1 xx 10^(-31) xx (5 xx 10^(5))^2 -1.6 xx 10^(-19) xx 0.5`
On solving `v_2=2.7xx 10^5 m//s`
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