Question

Light of wavelength 3500 Å is incident on two metals A and B. Which of them will yield photoelectrons, if their work functions are 4·2 eV and 1·9 eV respectively ? Make the necessary calculations to justify your answer.

Photoelectrons are emitted from a metal surface when illuminated with UV light of wavelength 330 nm. The minimum amount of energy required to emit the electrons from the surface is 3.5 × 10⁻¹⁹ J. Calculate: (i) the energy of the incident radiation, and (ii) the kinetic energy of the photoelectron.

Photoelectric emission occurs when a surface is irradiated with the radiation of frequency (i) v₁, and (ii) v₂. The maximum kinetic energy of the electrons emitted in the two cases are K and 2K respectively. Obtain the expression for the threshold frequency for the surface.

Name the factors on which photoelectric emission from a surface depends.