Just put a full picture clearly we can’t really see
They hit positive charges in the gold atoms.
As alpha particles are positively charged particles, they will experience repulsion force as soon as they approach positive charges in the center of the atom (in the nucleus).
Also remember that back at Rutherford time, they did not have the right visualization of the atom, they had a model of it like if it was a budding of positive charges and the negative charges are put into them. So this experiment gave a really better and more reliable imagination of the atom structure.
Hope this helps.
There is no reference point for this question? Is there an image you needed to put?
To calculate the volume of given metal, we use the formula
Given, the mass of metal 36.7 g and density of metal is 6.95 g/cm3
Therefore,
or
Thus, the volume of metal piece is