With a click at the picture, you will come to the topics.
Alpha particles, virtual experiment
An animation is available to get an overview of how the speed of alpha particles can be determined in crossed fields.
(Note: the ray pattern of alpha particles can not be seen, but in the animation is done as if that were possible)
An animation is available to display the function of the Wilsonian cloud chamber.
Parts of nuclear physics are presented in the two animations shown above.