clear;
clc;
printf("\nEx3.8\n");
//page no.-126
//given
n=5;................//quantum no.
a=2*10^-10;.........//width of box in m
E1=14.7*10^-19;.....//energy in joules
h=6.625*10^-34;.....//planck's constant in J-s

m=(h^2)/(8*E1*a^2)......//mass of particle in kg

printf("\nmass of particle is 9.33*10^-31 kg");