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Atoms — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsAtoms2 Marks
Question
Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydorgen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?
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Answer

Proton is nucleus of hydrogen atom. Its mass is 1.67 ×10 -27 kg while mass of incident a-particle is 6.64 ×10-27 kg. Since mass of scattered particle is more than the nucleus of target (proton), therefore, a-particle will not returned even in direct collision. 
It is analogous to the football collides with the tenis ball in the rest. 
Therefore scattering will not be able at large angles.

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