Question

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.

Give an example each of a metal from which photoelectric emission takes place when irradiated by (i) UV light (ii) visible light.

The work function of a metal is 4.50 eV. Find the frequency of light to be used to eject electrons from the metal surface with a maximum kinetic energy of 6.06×10⁻¹⁹J.

Ultra-violet light of wavelength 200 nm from a source is incident on a metal surface. If the stopping potential is –2.5 V, (a) calculate the work function of the metal, and (b) How would the surface respond to a high intensity red light of wavelength 6328 Å produced by a laser?