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clc//
//
//
//Variable declaration
n1=1;n2=1;n3=1;
h=6.62*10^-34; //planck's constant
m=9.1*10^-31; //mass(kg)
L=0.1*10^-9; //side(m)
//Calculation
E1=h^2*(n1^2+n2^2+n3^2)/(8*m*1.6*10^-19*L^2); //lowest energy of electron(eV)
//Result
printf("\n lowest energy of electron is %0.1f eV",E1)
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