Physics

This is actually a classic misconception about the photoelectric effect. The key insight is that intensity tells you how many photons hit the surface, not how energetic each photon is—and it's the energy of individual photons that determines electron kinetic energy. A brighter light (higher intensity) ejects more electrons, but each electron's maximum $KE$ depends only on the photon frequency $\nu$ through Einstein's relation $KE_{max} = h\nu - \phi$, where $\phi$ is the work function. Intensity is irrelevant to how fast individual electrons escape.

This is actually a classic misconception about the photoelectric effect. The key insight is that intensity tells you how many photons hit the surface, not how energetic each photon is—and it's the energy of individual photons that determines electron kinetic energy. A brighter light (higher intensity) ejects more electrons, but each electron's maximum $KE$ depends only on the photon frequency $\nu$ through Einstein's relation $KE_{max} = h\nu - \phi$, where $\phi$ is the work function. Intensity is irrelevant to how fast individual electrons escape.