Paper 2 Atomic Structure Drills

Q1 Rutherford Scattering

1. State two observations from the alpha-particle scattering experiment. [2]
2. Explain what each observation implies about atomic structure. [4]
3. Explain why alpha particles can be scattered through large angles. [2]

Q2 Energy Level Transition

An atom has energy levels $-13.6\mathrm{eV}$, $-3.40\mathrm{eV}$, and $-1.51\mathrm{eV}$.

1. Calculate the photon energy emitted for transition $-1.51\mathrm{eV}$ to $-3.40\mathrm{eV}$. [2]
2. Calculate the wavelength. Use $hc=1240\mathrm{eV}\mathrm{nm}$. [2]
3. Calculate the ionisation energy from the $-3.40\mathrm{eV}$ level. [1]

Q3 Emission and Absorption

1. Distinguish emission and absorption line spectra. [3]
2. Explain why absorption lines correspond to the same energy gaps as emission lines. [2]