Give two brief phenomena linked to the photoelectric effect that wave theory of light cannot account for.
The maximum energy $E_{\text{MAX}}$ of electrons emitted from a metal surface when it is illuminated by light of wavelength $\lambda$ is described by $E_{\text{MAX}} = hc\left(\frac{1}{\lambda} - \frac{1}{\lambda_0}\right)$, where $h$ is the Planck constant and $c$ is the speed of light. Identify the symbol $\lambda_0$.
Fig. 10.1 shows how $E_{\text{MAX}}$ varies with $\frac{1}{\lambda}$ for the metal surface. Use Fig. 10.1 to find the size of $\lambda_0$.
Use the gradient of Fig. 10.1 to find the Planck constant $h$.
The metal surface in (b) is oxidised. Photoelectric emission is still seen, but the work function energy is greater. On Fig. 10.1, draw a line that shows how $E_{\text{MAX}}$ varies with $\frac{1}{\lambda}$ for the oxidised surface.