clear;
clc;
printf("\nEx2.16\n");
//page no.-64
//given
m=9.11*10^-31;.............//mass of e in kg
E=1.6*10^-19;..............//energy in joule
h=6.625*10^-34;.............//planck's constant
//we knoe , E=m*v^2/2

v=sqrt((2*E)/m);..........//velocity in m/s
//By debroglie relationship

lambda=h/sqrt(2*m*E)...........//wavelength in m

printf("\nwavelength is 12.3 angstrom\n");