Astream of negatively charged particles is called: alpha radiation gamma radiation a cathode ray an x-ray

Alpha radiation is a stream of Helium nuclei.

An "alpha particle" is a bundle of 2 protons and 2 neutrons, 

and each proton has a positive charge.

Gamma radiation and X-rays are both electromagnetic

waves, just like radio or light.  They have no charge.

The stream of negatively charged particles is the cathode ray ...

a stream of electrons.  

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double the distance = divide strength by 4