The video explains the photoelectric effect, where light ejects electrons from a metal surface. Using a toll booth analogy, it illustrates how photons must have sufficient energy to cause this effect. The video discusses the importance of intensity, threshold frequency, and work function, and highlights historical contributions by Edmund Beckrel and Albert Einstein. It also explores practical applications, such as solar power and various devices, emphasizing the significance of the photoelectric effect in technology.

What role did Albert Einstein play in the understanding of the photoelectric effect?

Describe the practical applications of the photoelectric effect in modern technology.