clc 
// Given that
v = 2000 // velocity of neutron in m/sec
h = 6.62e-34 // Planck constant in J-sec
e = 1.6e-19 // charge on an electron in C 
m = 1.67e-27 // mass of neutron in kg
// Sample Problem 36 on page no. 14.35
printf("\n # PROBLEM 36 # \n")
printf("Standard formula used \n ")
printf(" lambda = h /(m*v)\n")
lambda = h / (m * v)
printf("\n de-Broglie wavelength is %f Angstrom.",lambda * 1e10)