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");