Light of frequency 6.4 × 1014 Hz is incident on a metal of work function 2.14 eV. The maximum kinetic energy of the emitted electrons is about:

In a photoelectric experiment, incident light of wavelength λ = 400 nm produces photoelectrons with a stopping potential of 2.5 V. Calculate the work function of the metal (Take hc ≈ 1240 eV·nm).

A metal has a work function of 2 eV. What is the minimum energy required (in joules) to emit an electron from its surface?