TP 30.14

          Given:   f = 9.95 x 1014 Hz

                       

                       Kmax = 0.180 x 10-19 J

 

           Find:   W0 - ?

                        

Kmax = h f - W0

          

W0 = h f - Kmax

 

W0 =  (6.63 x 10-34 J-s)(9.95 x 1014 Hz) – (0.180 x 10-19 J) = 6.42 x 10-19 J = (6.42 x 10-19 J)(1 eV)/(1.60 x 10-19 J) = 4.01 eV