WAEC Physics 2025 Theory — Question 22

Model answer

Photon: an electromagnetic radiation (a quantum of light); carries no electric charge; has no rest mass; its energy depends on its frequency. Photoelectron: a particle of matter (an electron); is negatively charged; has a rest mass (9.1×10⁻³¹ kg); its (kinetic) energy depends on the work function of the metal and the frequency/energy of the incident radiation.