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What do you think would be the obser vat...

What do you think would be the obser vation if the two particles scattering experiment is carried out using a foil of a metal other than gold ?

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If particle scattering experiments 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 and particles would bounce back and no idea about the location of positive mass in the atom would be available with such a certainity.
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