The outcomes of the $\alpha$-particle scattering experiment led to the nuclear model for the atom. State the outcomes that showed that most of the atom’s mass is concentrated in a very small region and that most of the atom is empty space.
State what $\gamma$-radiation is composed of.
Table 7.1 shows the names of three particles and the classifications that may apply to them. Complete Table 7.1 by placing ticks (✓) in the boxes to show the classifications that apply to each particle.
A particle with an unusual charge was an important discovery in the development of quark theory. The particle is a hadron with a mass of $2.19 \times 10^{-27}\,\text{kg}$ and a charge of $+2e$, where $e$ is the elementary charge. Calculate the mass, in u, of the particle. Give your answer to three significant figures.
Determine a possible quark composition for a hadron with charge $+2e$. Explain your reasoning.