When a source of $\alpha$-particles is aimed at a thin metal foil, the particles are deflected. Which result from this experiment gives evidence for a small charged nucleus?
- AA small proportion of the $\alpha$-particles come straight back from the foil towards the source.
- BA small proportion of the $\alpha$-particles pass straight through the foil.
- CSome of the $\alpha$-particles are deflected by an angle of less than $90^{\circ}$.
- DSome of the $\alpha$-particles follow a curved path after leaving the foil.