JEE Main 20205 Sep, Evening shiftPhysicsMediumDual Nature of Matter and Radiation146× since 2002
The surface of a metal is illuminated alternately
with photons of energies E₁ = 4 eV and E₂ = 2.5 eV
respectively. The ratio of maximum speeds of the
photoelectrons emitted in the two cases is 2. The
work function of the metal in (eV) is _____.