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Finding collisions
Beam particles whose tracks do NOT remain parallel all the way through the
picture must have collided with a proton in a hydrogen atom. There are two
collisions here. (Click on picture, then move cursor 
over
A or B to activate).
In a real experiment
both these collisions would have been recorded and analysed. Here we will
concentrate on the more interesting 'event' B
that produces a spray of 4 charged particles.