in the study of Geiger marsden experiment on scattering of Alpha particle by thin foil of Gold draw the trajectory of Alpha particles in the coulomb field of target nucleus explain briefly have one gets the information on the size of nucleus from the study.
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Trajectory of a-particles in the coulomb field of target nucleus is shown below:

From this experiment, the following points are observed.
(i) Most of the particles pass straight through the gold foil. It means that they do not suffer any collision with gold atoms.
(ii) About one particle in every 8000 particles
deflects by more than 90°. As most of the particles go undeflected and only a few get deflected, this shows that most of the space in an atom is empty and at the centre of the atom, there exists a nucleus. By the number of particles get deflected, the information regarding size of the nucleus can be known

From this experiment, the following points are observed.
(i) Most of the particles pass straight through the gold foil. It means that they do not suffer any collision with gold atoms.
(ii) About one particle in every 8000 particles
deflects by more than 90°. As most of the particles go undeflected and only a few get deflected, this shows that most of the space in an atom is empty and at the centre of the atom, there exists a nucleus. By the number of particles get deflected, the information regarding size of the nucleus can be known
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