A light from Paschen series of hydrogen atom is able to eject photoelectrons from a metal. Then the work function of the metal is

Step-by-step solution

In Paschen series electron transmits from some higher state to n=3 state So photons of paschen series have energies, ranging from E_ =E_ n=4 -E_ n=3 aligned & =-0.85-(-1.5 l ) & =0.66 eV aligned to E_ =E_ n= -E_ n=3 aligned & =0-(-1.5 l ) & =1.51 eV aligned So, if a photon of paschen series able to emit a photoelectron from a metal, then work function ₀ of metal must be such that, ₀ Photon energy or ₀ 1.51 eV Only matching option is options (d).