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The distance of the closest approach of ...

The distance of the closest approach of an `alpha`- particle fired at a nucleus with kinetic energy K is `r_(0)`. The distance of the closest approach when the `alpha`-particle is fire at the same nucleus with kinetic energy 2K will be

A

`4r_(0)`

B

`(r_(0))/(2)`

C

`(r_(0))/(4)`

D

`2r_(0)`

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