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clear;
clc;
printf("\nEx2.9\n");
//page no.-58
//given
m=9.1*10^-28;..........//mass of electron in gm
e=4.8*10^-10;.............//charge in e.s.u.
h=6.62*10^-27;.............//planck's constant in erg-sec
V=28.8;....................//potential diff. in volt
lambda=h*sqrt(150/(m*e*V)).............//wavelength in cm
printf("\nde-Broglie wavelength is 2.3 angstrom\n");
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