////Given
W=2.26*1.6*10**-19                             //ev
v=10**6                                        //m/s
m=9*10**-31
h=6.6*10**-34
//Calculation
V=((1/2.0)*m*v**2+W)/h

//Result
printf("\n frequency of incident radiation  %0.2f *10**15 HZ",V*10**-15)