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clear
//
//
//
//Variable declaration
n=1
hbar=1.054*10**-34
m=1.67*10**-27 //mass of neutron(kg)
a=10**-14 //size(m)
//Calculation
E=n**2*%pi**2*hbar**2/(2*m*a**2) //lowest energy of neutron(J)
//Result
printf("\n lowest energy of neutron is %0.2f MeV",E/(1.6*10**-13))
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