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Udith posted an Question

May 17, 2020 • 03:18 am

30 points

IIT JAM
Physics (PH)

Doubt on alpha particle scattering expt

How it is proved that the entire mass of the atom is in the centre of the atom?

1 Answer(s)

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Dhairya sharma

see the attached.
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Dhairya sharma

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

hope you are getting..
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Abhishek singh

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, almost 99.99% particles pass undeflected. it means most of the space inatom is vacant and the nuclei is located at centre.
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this will clear your doubts.
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Dhairya sharma

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

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 concentrated at the center containing whole mass..
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Dhairya sharma

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

this is proved by Rutherford experiment that entire mass is present inside the nucleus of an atom
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ok but how it is proved that nucleus is in the center of the atom
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