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clear
//
//
//
//Variable declaration
T=273+25; //temperature(K)
m=4;
n=5*10^11; //density(per m^3)
V=(2*2.82*10^-10)^3; //volume(m^3)
kB=8.625*10^-5;
//Calculations
N=m/V;
Ep=2*kB*T*log(N/n);
//Result
printf("\n energy required is %0.3f eV",Ep)
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