List of top Physics Questions on Photoelectric Effect asked in CBSE CLASS XII

In a photoelectric experiment with a material of work function 2.1 eV, the stopping potential is found to be 2.5 V. The maximum kinetic energy of ejected photoelectrons is:
In his experiment on photoelectric effect, Robert A. Millikan found the slope of the cut-off voltage versus frequency of incident light plot to be \( 4.12 \times 10^{-15} \, \text{Vs} \). Calculate the value of Planck’s constant from it.
Mention any three features of results of experiment on photoelectric effect which cannot be explained using the wave theory of light.
Explain the existence of threshold frequency of incident radiation for photoelectric emission from a given surface.
Assertion (A): Electrons are ejected from the surface of zinc when it is irradiated by yellow light.
Reason (R): Energy associated with a photon of yellow light is more than the work function of zinc.