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//Example 5_11
clc();
clear;
//To find the wavenength and energy
n=4
a=107.87 //units in amu
N=10500
row=6.052*10^26
a=((n*a)/(N*row))^(1/3)*10^10 //units in A
h=1
k=1
l=1
d=a/sqrt(h^2+k^2+l^2) //units in A
theta=19. //units in degrees
lamda=2*d*sin(theta*%pi/180) //units in A
printf("Wavelength is lamda=%.2fA",lamda)
lamda=lamda*10^-10 //units in meters
h=6.625*10^-34 //Plancks constant
c=3*10^8 //units in meter/sec
energy=(h*c)/(lamda*1.6*10^-19) //units in eV
printf("\n energy is =%d eV",energy)
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