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clear
//Given
Z=79
e=1.6*10**-19                 //C
v=1.6*10**-12
m=9*10**9

//Calculation
//
b=(m*Z*e**2*(1/(tan(45*3.14/180.0))))/v

//Result
printf("\n (a) Scattering angle is 180 degree")
printf("\n (b) The value of scattering angle decreases")
printf("\n (c) Impact parameter is %0.1f *10**-14 m",b*10**14)
printf("\n (e) Scattering angle is increase with decrease in impact parameter")