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////Given
W=3 //ev
h=6.63*10**-34
e=1.6*10**-19
lembda=3.0*10**-7 //m
c=3*10**8 //m/s
//Calculation
v0=(W*e)/h
v=c/lembda
E=h*(v-v0)
E1=(h*(v-v0))/(1.6*10**-19)
V0=E/e
//Result
printf("\n (a) Threshold frequency %0.2f *10**15 HZ",v0*10**-15)
printf("\n (b) Maximum energy of photoelectron %0.2f eV",E1)
printf("\n (c) Stopping potential %0.2f V",V0)
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