clear;
clc;
printf("\nEx3.19\n");
//page no.-135
//given
m=9.1*10^-31;.......//mass of electron in kg
a=4*10^-10;........//length in m

E=(h^2)/(8*m*a^2)..........//lowest energy in joules

printf("\nlowest energy is 0.376*10^-18 J\n");