688.5 eV to nm

688.5 eV = 1.8008 nm

eVnm
673.5 eV1.8409
678.5 eV1.8273
683.5 eV1.814
688.51.8008
693.5 eV1.7878
698.5 eV1.775
703.5 eV1.7624

688.5 eV = 1.8008 nm

Formula

E(eV) = 1239.84 ÷ λ(nm) · f(THz) = E(eV) × 241.799 · E = hc/λ = hf