What do you think would be the observation
Question.
What do you think would be the observation if the $\alpha$-particle scattering experiment is carried out using a foil of a metal other than gold?

Solution:
If $\alpha$-particle scattering experiment is carried out using a foil of any metal as thin as gold foil used by Rutherford, there would be no change in observations. But since other metals are not so malleable. So, such a thin foil is difficult to obtain. If we use a thick foil, then more $\alpha-$ particles would bounce back and no idea about the location of positive mass in the atom would be available with such a certainty.
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