In a scattering experiment, protons of kinetic energy 5.5 MeV5.5 \text{ MeV}5.5 MeV are fired at a thin platinum foil containing platinum nuclei (proton number Z=78Z = 78Z=78). What can be deduced about the nuclear radius rrr of platinum from the distance of closest approach in this experiment?
r<2.0×10−14 mr < 2.0 \times 10^{-14} \text{ m}r<2.0×10−14 m
r>2.0×10−14 mr > 2.0 \times 10^{-14} \text{ m}r>2.0×10−14 m
r≈7.0×10−15 mr \approx 7.0 \times 10^{-15} \text{ m}r≈7.0×10−15 m
r<7.0×10−15 mr < 7.0 \times 10^{-15} \text{ m}r<7.0×10−15 m
128 exam-style questions on AQA A Level Physics Radioactivity (A-level only), covering Rutherford scattering (A-level only), $\alpha$ , $\beta$ and $\gamma$ radiation (A-level only), Radioactive decay (A-level only), Nuclear instability (A-level only), Nuclear radius (A-level only), Mass and energy (A-level only), Induced fission (A-level only), and Safety aspects (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.