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The radius of a nucleus determined  by electron scattering is found to  be slightly different from that determined  by alpha particles scattering.  This is because  electron scattering  senses the charge distribution of the nucleas,  whereas alpha and similar particles senses the nuclear matter.

please explain these paragraph. 

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answered by (2.1k points)
Well  there  is a   difference  in determining  the radius  of the nucleas   by electron  scattering  experiments  and alpha  particle  scattering  experiment. The electrons  can penetrate  the nucleas  and give more precise measurements  of radius while alpha particle are deflected  with some angles. That's  why electron senses the charge distribution  and alpha senses the nuclear   matter repulsion.

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