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Endothermic and Exothermic Reaction

Why are the "...

Question

Why are the "deflections caused by an aluminum foil less than that of gold foil in an $α$ -ray scattering experiment. Can these deflections be changed by changing the kinetic energy of $α$ -particles".

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Solution

Deflections caused by an aluminium foil less than that by gold foil in an $α$ - ray scattering experiment because the mass of the gold foil is heavier than aluminium foil.
So the substances with heavier mass deflects more. So the deflections changes by the changing in the kinetic energy of the alpha particles.

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