An electron of mass m moving with a velocity v collides head on with an atom of mass m. as a result of the collision a certain fixed amount of energy δe is stored internally in the atom. the minimum initial velocity possessed by the electron is :
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if it has minimum velocity it means that whole of its kinetic energy will be stored as internal energy.
de = 1/2 * m * Vmin²
Vmin =√( 2 * de / m )
de = 1/2 * m * Vmin²
Vmin =√( 2 * de / m )
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