A metal exposed to light of wavelength 800 nm and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photo-electron doubles when light of wavelength 500 nm is used. The work function of the metal is: (Take hc=1230 eV-nm ). [July 25, 2022 (D)]
(a) 1.537 eV
(b) 2.46 eV
(c) 0.615 eV
(d) 1.23 eV