Question

Question 4
What do you think would be the observation if $\alpha$ -particle scattering experiment is carried out using a foil of a metal other than gold?

Answer 1

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, 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.