| Author: santosh kumar | Member Level: Bronze | Revenue Score:  |
Ernest Rutherford selected a gold foil because he wanted a thin layer as thin a layer as ppossible.This gold foil was about 1000 atoms thick.
Alpha particles are doubly charged helium ions.Since they have a mass 4 units,the fast moving alpha particles have a considerable amount of energy.
It was considered that alpha particlews would be deflected by the sub-atomic particles in the gold atoms.Since the alpha particless were much heavier than the protons,he did not expect to see large deflections.
But the alpha scattering experiment gave totally unexpected results.The following were the observations made of:-
(1)Most of the fast moving alpha particles passed straight through the gold foil.
(2)Some of the alpha particles were deflected by the foil by small angles.
(3)Surprisingly one out of every 12000 particles appeared to rebound.
(4)rutherford's experiment shows that there are 3 kinds of particle which have electronical carged and atracted to opposite charges.
(5)his exeperiment also shows that ifa partical came back in a straightline that mean a strong +vly charged particle is situated in the middle of the atom which we told tha the core of the atom.
In the words of Rutherford,"This result was almst as incredible as if you fire a fifteen inch shell at a piece of tissue paper and tissue paper and it come backs and hits you".
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