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clear;
clc;
printf("\nEx3.18\n");
//page no.-134
//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");
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