A result of the $\alpha$-particle scattering experiment is that a tiny fraction of the $\alpha$-particles are deflected through angles greater than $90^\circ$. State what this suggests about the structure of the atom.
An $\alpha$-particle is made up of other particles. One of these particles is a proton. State and explain whether a proton counts as a fundamental particle.
A radioactive source emits a beam of $\alpha$-particles in a vacuum. The mean current in the beam is $6.9 \times 10^{-9}\,\text{A}$. Calculate the average number of $\alpha$-particles passing a fixed point in the beam during $1.0\,\text{minute}$.
The $\alpha$-particles in the vacuum in (c) enter a uniform electric field. They enter the field with their velocity in the same direction as the field. State and explain whether the magnitude of the acceleration due to the field decreases, increases or stays constant as the $\alpha$-particle travels through the field.
A nucleus $X$ is an isotope of a nucleus $Y$. The mass of nucleus $X$ is greater than that of $Y$. Both nuclei are placed in the same uniform electric field. State and explain whether the magnitude of the electric force on nucleus $X$ is greater than, less than or the same as the force on nucleus $Y$.