State what the threshold frequency means, with reference to the photoelectric effect.
Electromagnetic radiation with wavelength $\lambda$ falls on a metal surface, and electrons with maximum kinetic energy $E_{\text{MAX}}$ are produced. On Fig. 11.1, sketch how $E_{\text{MAX}}$ varies with $\frac{1}{\lambda}$.
State an equation linking the gradient of the graph in Fig. 11.1 to the Planck constant $h$. Explain any symbols you use.
Explain why, for a given wavelength of electromagnetic radiation, most emitted electrons have kinetic energies below the maximum value $E_{\text{MAX}}$.
Electromagnetic radiation with wavelength $\lambda$ falls on a metal surface, and electrons with maximum kinetic energy $E_{\text{MAX}}$ are produced.
Light of one wavelength shines on a metal surface and produces a photoelectric current. The wavelength is reduced while the light intensity remains constant. State and explain, if there is any, the change in the photoelectric current.