Collision between alpha particle and helium atom

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rogerkitkit
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Why their tracks after collision has an angle 90 degree?
Any detail derive?
 
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rogerkitkit said:
Why their tracks after collision has an angle 90 degree?
Any detail derive?

What have you tried and where did you get stuck?
 
rogerkitkit said:
Why their tracks after collision has an angle 90 degree?
Any detail derive?
Try solving 2D collision of bodies of equal mass, where one of them is initially at rest.