E = hf + Wo_oo
E = 1.12 x 10−18^{-18}−18J
Max. Energy = 8.0 x 10−19^{-19}−19J.
Wo_oo = E - Max. Energy = 1.12 x 10−18^{-18}−18J - 8.0 x 10−19^{-19}−19J. = 3.2 x 10−19^{-19}−19J.
But Wo_oo = hfo_oo
fo_oo = Woh\;\frac{W_o}{h}hWo = 3.2×10−196.626×10−34\;\frac{3.2 \times 10^{-19}}{6.626 \times 10^{-34}}6.626×10−343.2×10−19 = 4.83 x 1014^{14}14Hz
