To calculate work function, start by understanding material properties like electron affinity and bandgap. Then, consider the energy and field interactions that drive electron emission, including Planck’s constant. Next, use emission equations like the Richardson-Dushman equation to predict the rate of electron emission. Explore different emission mechanisms like the photoelectric effect and thermionic emission, and their underlying principles. Finally, consider the role of vacuum and thermoelectricity in electron emission phenomena.