Question
Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen 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
Hydrogen nuclei (or protons) are much lighter than a-particles. So $\alpha$-particles are not scattered by solid hydrogen. They pass through solid hydrogen almost undeflected from their paths.
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