First slide
Scattering of a-particles and Rutherford’s nuclear Model of Atoms.

An α-particle of 7 MeV energy strikes with a nucleus of uranium at stationary at an scattering angle of 180o. The nearest distance upto which α-particle reaches the nucleus will be of the order of   


At closest distance of approach 
Kinetic energy = Potential energy 

For uranium z= 92, so r=5.3×1012cm

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