= Joseph John Thomson
{c}
= J. J. Thomson
{c}
{synonym}
A <physicist>.https://www.nobelprize.org/prizes/physics/1906/thomson/biographical/[Biographical identity and professional specialization]{ref}
\Image[https://upload.wikimedia.org/wikipedia/commons/5/5e/JJ_Thomson.jpg]
{title=Portrait of <Joseph John Thomson>}
{width=240}
The <Thomson charge-to-mass experiment> used electric and magnetic deflections of <cathode rays> to investigate their charged constituents. It determines a <charge-to-mass ratio>; separating <electric charge> from <mass> requires additional information.
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