Photoelectric Emission

Light rays of wavelength $\mathrm{\lambda } \mathrm{and} \frac{\mathrm{\lambda }}{2}$ are incident on a photosensitive metal. If the maximum kinetic energy of the emitted photoelectrons from the metal surface in the second case be $3$ times the maximum kinetic energy of emitted photoelectrons in the first case then determine the work function of the metal.

Write down Einstein's photoelectric equation.

Give an example of the production of an electron by a photon.

When light of wavelength $\text{λ and 2λ}$ are incident on the metal surface, the stopping potentials are ${\mathrm{V}}_0 \mathrm{and} \frac{{\mathrm{V}}_0}{4}$ respectively. If $\mathrm{c}$ is the velocity of light in air, find the threshold frequency of the photoelectric emission.

Define stopping potential