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Atoms — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsAtoms1 Mark
Question
The nucleus of atom is responsible for $\alpha$-particle scattering with large angle, why does not the electron?
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Answer

Mass of electron is less than the helium, therefore according to conservation law of momentum, it cannot scattered the $\alpha$-particle at large angle.

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