Which of the following phenomena provides direct evidence for the existence of discrete energy levels within a nucleus?
The scattering of alpha particles by gold foil.
The wave-like behavior of electrons in diffraction experiments.
The emission of beta particles with a continuous spectrum of energies.
The emission of gamma-ray photons with specific, discrete wavelengths.
31 exam-style questions on AQA A Level Physics Electromagnetic radiation and quantum phenomena, covering The photoelectric effect, Collisions of electrons with atoms, Energy levels and photon emission, and Wave-particle duality. Each one has a worked solution and a mark scheme showing where the marks go.