WAEC Physics 2023 Theory — Question 5

Model answer

(a) Diffusion is the process where fluid molecules move randomly and collide with neighbouring molecules due to the possession of kinetic energy, resulting in their spreading/mixing throughout the fluid. (b)(i) Wave: Refraction, Reflection, Diffraction or Interference or Polarisation demonstrate that light behaves as a wave. (ii) Particle: Photoelectric effect, Compton effect/scattering, or Black body radiation demonstrate that light behaves as a particle.