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Electrons are caused to fall through a p...

Electrons are caused to fall through a potential difference of 1500 V. If they are initially at rest, their final speed is

A

`4.6xx10^(7)ms^(-1)`

B

`2.3xx10^(7)ms^(-1)`

C

`0.23xx10^(2)ms^(-1)`

D

`5.1xx10^(9)ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
b
Use `eV=(1)/(2)mv^(2)`
`v=sqrt((2eV)/(m))=sqrt((2xx1.6xx10^(-19)xx1500)/(9xx10^(-31)))m//s`
`=2.3xx10^(7)ms^(-1)`
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