Photoelectric experiments are performed with five different metals. Given the work function of the metal and

Photoelectric experiments are performed with five different metals. Given the work function of the metal ϕ and the energy of the incident photons E, rank the experiments in order of the stopping potential, largest to smallest. 

(a) ϕ = 2.0 eV, E = 2.8 eV; 

(b) ϕ = 2.2 eV, E = 3.0 eV; 

(c) ϕ = 2.8 eV, E = 3.0 eV; 

(d) ϕ = 2.0 eV, E = 3.0 eV; 

(e) ϕ = 2.4 eV, E = 2.8 eV.