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The minimum kinetic energy of an electro...

The minimum kinetic energy of an electron,hydrogen ion,helium ion required for ionization of a hydrogen atom is `E_(1)` in case electron is colided with hydrogen atom. It is `E_(2)` if hydrogen ioniscollided and `E_(3)` when helium ioniscollided.Then:

A

`E_(1)=E_(2)=E_(3)`

B

`E_(1) gt E_(2) gt E_(3)`

C

`E_(1) lt E_(2) lt E_(3)`

D

`E_(1) gt E_(3) gt E_(2)`

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