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clc//
//
//
//Variable declaration
m=9.1*10^-31; //mass of electron(kg)
h=6.626*10^-34; //planck's constant
n=1;
L=4*10^-10; //side(m)
//Calculation
E1=n^2*h^2/(8*m*L^2); //lowest energy of electron(joule)
//Result
printf("\n lowest energy of electron is %0.3f *10^-18 joule",E1*10^18)
printf("\n answer varies due to rounding off errors")
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