clear;
clc;
printf("\nEx2.27\n");
//page no.-71
//given
h=6.63*10^-34;..............//planck's constant in joule-sec
m=1.67*10^-27;..............//mass of proton
E=1.6*10^-19;...........//energy in joule

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

printf("\nwavelength is 0.287 angstrom \n");