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////Given
clear
E=100 //ev
m=9.1*10**-31
e=1.6*10**-19
h=1.054*10**-34
x=10.0**-6 //m
//Calculation
//
p=sqrt(2*m*E*e)
p1=h/x
theta=p1/p
//Result
printf("\n uncertainty in the angle of emergence %0.1f *10**-4 radians",theta*10**4)
printf("\n 4 seconds of arc")
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