Physics 9702 · AS & A Level · Atoms, nuclei and radiation
Atoms, nuclei and radiation — practice question
The findings from the $\alpha$-particle scattering experiment supplied evidence that the nucleus exists and that it is very small.
(a(i))[2]
State the observation that gave evidence that the nucleus is small compared with the atom.
(a(ii))[2]
State the observation that gave evidence that the nucleus is charged and contains most of the mass of the atom.
(b)[2]
The $\alpha$-particles in this experiment came from the decay of a radioactive nuclide. Suggest two reasons why $\beta$-particles from a radioactive source would be unsuitable for this kind of scattering experiment.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “most $\alpha$-particles were deflected through small angles (allow straight through)” …