Doubt on alpha particle scattering expt

see the attached.

and in alPha partcle scattering one particle in 20000 returns back so we consider maximum part is empty bcoz 19999 paericle skip.so

hope you are getting..

In Rutherford alpha particle experiment, very few particles were reflected back by 180°(when the alpha beam pass through exactly the centre of nucleus) .. and other than that, almo...

but in atomic physics we consider that both neuclus and electrons revolve about their centre of mass

because all the alpha particles will deflected ,only 1 out of 10,000 particle is come back to its own path and this shows that there must be something (but very small) that is conc...

its not always true we consider it bcoz protons are 1837 times heavy then electrons .so

this is proved by Rutherford experiment that entire mass is present inside the nucleus of an atom