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//Example 5_15
clc();
clear;
//To calculate the Braggs angle
h=6.63*10^-34 //Plancks Constant
m=9.1*10^-31
e=1.6*10^-19
v=80
lamda=h/sqrt(2*m*e*v) //units in mts
lamda=lamda*10^9 //units in nm
a=0.35 //units in nm
h=1
k=1
l=1
d111=a/sqrt(h^2+k^2+l^2) //units in nm //units in nm
theta=asin(lamda/(2*d111)) //units in radians
theta=theta*180/%pi //units in degrees
printf("Braggs angle is theta=%.2fDegrees or 19Degrees40Minutes",theta)
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