Question: Q. 12. An α-particle moving with initial kinetic energy K towards a nucleus of atomic number Z approaches a distance ’ d ’ at which it reverses its direction. Obtain the expression for the distance of closest approach ’ d ’ in terms of the kinetic energy of α-particle K.

A [OD 2014]

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Solution:

Ans. At the distance, d, the K.E. (K) gets converted into P.E. of the system.

Hence K=14πε02eZed

d=14πε02eZeK



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